The following outline provides an overview of and topical guide to lichens.

An intricately branched, pale green lichen hangs from a branch.
Usnea filipendula – one of about 20,000 described species of lichen

Lichencomposite organism made up of multiple species – a fungal partner, one or more photosynthetic partners, which can be either green algae or cyanobacteria, and, in at least 52 genera of lichens, a yeast.[1] In American English, "lichen" is pronounced the same as the verb "liken" (/ˈlkən/). In British English, both this pronunciation and one rhyming with "kitchen" (/ˈlɪən/) are used.[2]

What type of thing is a lichen?

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A lichen can be described as all of the following:

  • Composite organism – a symbiotic life form composed of multiple partners from different biological domains, families and kingdoms, and from different phyla, classes and divisions within those domains and kingdoms. In the case of lichens, a fungal partner (the mycobiont) combines with one or more photosynthetic partner(s) (the photobiont) as well as (in some cases) a yeast.
  • Eukaryote (domain) – organisms with a cell nucleus within a nuclear envelope; both the mycobiont and any algal partners fall into this domain.[3]
  • Fungi (kingdom) – the fungal partner and any yeast partner fall into this kingdom.[1]
  • For the biological classes and families these fungi belong to, see below.
  • Prokaryote (domain) – organisms without a cell nucleus; any cyanobacterial partner falls into this domain.[3]

Nature of lichens

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Schematic cross section of foliose lichen:
(a) The cortex is the outer layer of tightly woven fungal filaments (hyphae)
(b) This photobiont layer has photosynthesizing green algae
(c) Loosely packed hyphae in the medulla
(d) A tightly woven lower cortex
(e) Anchoring hyphae called rhizines, where the fungus attaches to the substrate

Morphology

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  • Apoplast – the symbiotic interface zone between the mycobiont and photobiont, outside the cell membranes or walls of both.[8]
  • Haustorium (pl. haustoria) – a root-like structure which allows the fungal partner to extract nutrients from its photosynthetic partner(s).[9]
  • Lichen morphology – a lichen's external appearance and structures are very different than those of its individual partners.[10]
  • Ascocarp – the fruiting body of a lichen, which contains the asci.[11]
  • Ascus (pl. asci) – a sexual, fungal spore-bearing structure, typically sac-like in shape.[12]
  • Ascospore – a fungal spore, the product of meiosis, produced in an ascus.[13]
  • Epispore – a transparent bag-like outer covering on some spores,[9] which helps to determine spore shape.[14]
  • Cephalodium (pl. cephalodia) – a gall-like structure that contains cyanobacteria[15]
  • Hypha (pl. hyphae) – a long, branching, thread-like structure composed of one or more fungal cells, which typically makes up a large part of lichens; hyphae are densely compacted in the cortex and more loosely interwoven in the medulla.[16]
  • Pycnidium (pl. pycnidia) – a flask-shaped, asexual fruiting body possessed by some lichens.[17]
  • Conidium (pl. conidia) – an asexual fungal spore produced in pycnidia by some lichens.[18]
  • Rhizine – a root-like structure that anchors a lichen to the substrate on which it grows.[19]
  • Soralium (pl. soralia) – a localized region or structure, typically a crack or pore, containing soredium.[20]
  • Soredium (pl. soredia) – asexual reproductive propagules composed of loose clumps of fungal hyphae and photobiont cells, produced in soralia.[20]
  • Thallus (pl. thalli) – the vegetative body of a lichen, made up of both mycobiont and photobiont components.[21]
  • Cortex – the lichen's outer layer(s), made up of tightly woven fungal filaments.[22]
  • Isidium (pl. isidia) – outgrowths of the thallus which contain photobiont cells and provide means of vegetative reproduction for some lichens.[23]
  • Medulla – a loose layer of interwoven fungal hyphae within the thallus.[24]
  • Podetium (pl. podetia) – an upright secondary thallus, which supports the fruiting bodies of Cladonia species.[25]

Ecology

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Lichens with a cyanobacteria as the photosynthetic partner, like this Peltigera collina, can fix nitrogen.[26]

Types of lichens

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Lichen lists

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Lichen taxonomical classifications

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Chaenotheca brunneola falls into Coniocybomycetes, a small fungal class which contains only a handful of lichen species.[34]

Lichen systematics – Although they are composite organisms, lichens have traditionally been classified on the basis of their fungal partner. These span eight different biological classes, 39 orders, 117 families, and around 1,000 genera.[34][35]

Classes

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Lichens fall into eight fungal classes and several subclasses:[38]

Orders

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Lecidella elaeochroma is a member of Lecanorales, the fungal order which contains the greatest number of lichen species.[38]

They are split across nearly 40 orders. Those which cannot be assigned to a particular order are assigned instead to "incertae sedis" within the appropriate class. These orders were listed in Lücking, Hodkinson and Leavitt's 2016 treatise on the classification of lichenized fungi, except where otherwise noted,[38] with orders updated in 2021.[34]

Families

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They fall into 117 families. Those which cannot be assigned to a particular family are assigned instead to "incertae sedis" within the appropriate order. These were listed in Lücking, Hodkinson and Leavitt's 2016 treatise on the classification of lichenized fungi, except where otherwise noted;[35] families were updated in 2021.[34]

  1. Acarosporaceae
  2. Agyriaceae
  3. Andreiomycetaceae
  4. Aphanopsidaceae
  5. Arctomiaceae
  6. Arthoniaceae
  7. Arthrorhaphidaceae
  8. Atheliaceae
  9. Baeomycetaceae
  10. Biatorellaceae
  11. Brigantiaeaceae
  12. Caliciaceae
  13. Cameroniaceae
  14. Candelariaceae
  15. Carbonicolaceae
  16. Catillariaceae
  17. Celotheliaceae
  18. Chrysotrichaceae
  19. Cladoniaceae
  20. Clavulinaceae
  21. Coccocarpiaceae
  22. Coccotremataceae
  23. Coenogoniaceae
  24. Collemataceae
  25. Coniocybaceae
  26. Corticiaceae
  27. Cystocoleaceae
  28. Dacampiaceae
  29. Dactylosporaceae
  30. Elixiaceae
  31. Fuscideaceae[41]
  32. Gloeoheppiaceae
  33. Gomphillaceae
  34. Graphidaceae
  35. Gyalectaceae
  36. Gypsoplacaceae
  37. Haematommataceae
  38. Harpidiaceae[42]
  39. Helocarpaceae
  40. Hygrophoraceae
  41. Hymeneliaceae
  42. Icmadophilaceae
  43. Koerberiaceae
  44. Lecanographaceae
  45. Lecanoraceae
  46. Lecideaceae
  47. Lepidostromataceae
  48. Leprocaulaceae
  49. Letrouitiaceae
  50. Lichinaceae
  51. Lopadiaceae
  52. Lyrommataceae
  53. Malmideaceae
  54. Massalongiaceae
  55. Megalariaceae
  56. Megalosporaceae
  57. Megasporaceae
  58. Melaspileaceae
  59. Microtheliopsidaceae
  60. Monoblastiaceae
  61. Mycoporaceae
  62. Nephromataceae
  63. Ochrolechiaceae
  64. Opegraphaceae
  65. Ophioparmaceae
  66. Pachyascaceae
  67. Pannariaceae
  68. Parmeliaceae
  69. Peltigeraceae
  70. Peltulaceae
  71. Pertusariaceae
  72. Phaneromycetaceae[41][43]
  73. Phlyctidaceae
  74. Physciaceae
  75. Pilocarpaceae
  76. Placynthiaceae
  77. Protothelenellaceae
  78. Psilolechiaceae
  79. Psoraceae
  80. Pycnoraceae
  81. Pyrenotrichaceae
  82. Pyrenulaceae
  83. Ramalinaceae
  84. Ramboldiaceae
  85. Redonographaceae[41]
  86. Requienellaceae
  87. Rhizocarpaceae
  88. Roccellaceae
  89. Roccellographaceae
  90. Ropalosporaceae
  91. Sagiolechiaceae
  92. Sarrameanaceae
  93. Schaereriaceae
  94. Scoliciosporaceae
  95. Sphaerophoraceae
  96. Sporastatiaceae
  97. Stereocaulaceae
  98. Stictidaceae
  99. Strangosporaceae
  100. Strigulaceae
  101. Teloschistaceae
  102. Tenuitholiascaceae[44][45]
  103. Tephromelataceae
  104. Thelenellaceae
  105. Thelocarpaceae
  106. Thrombiaceae
  107. Trapeliaceae
  108. Trichosphaeriaceae[42]
  109. Trichotheliaceae[41]
  110. Trypetheliaceae
  111. Umbilicariaceae
  112. Vahliellaceae
  113. Varicellariaceae
  114. Verrucariaceae
  115. Vezdaeaceae
  116. Xanthopyreniaceae
  117. Xylographaceae

Genera

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Extant lichens are found in more than 1000 genera. These were listed in Lücking, Hodkinson and Leavitt's 2016 treatise on the classification of lichenized fungi, except where otherwise noted.[35]

  1. Absconditella
  2. Acantholichen
  3. Acanthothecis
  4. Acanthotrema
  5. Acarospora
  6. Acarosporina
  7. Aciculopsora
  8. Acolium
  9. Acrocordia
  10. Acroscyphus
  11. Actinoplaca
  12. Adelolecia
  13. Aderkomyces
  14. Aggregatorygma
  15. Agonimia
  16. Ahtiana
  17. Ainoa
  18. Albemarlea[46]
  19. Alectoria
  20. Allantoparmelia
  21. Allocalicium
  22. Allocetraria
  23. Allographa[47]
  24. Allophoron[42]
  25. Alyxoria
  26. Amandinea
  27. Amazonomyces
  28. Amazonotrema
  29. Ameliella
  30. Amphorothecium
  31. Ampliotrema
  32. Amundsenia
  33. Amygdalaria
  34. Amylora
  35. Anamylopsora
  36. Anaptychia
  37. Ancistrosporella
  38. Andina[48]
  39. Andreiomyces
  40. Anema
  41. Angiactis
  42. Anisomeridium
  43. Anomalographis
  44. Anomomorpha
  45. Antennulariella
  46. Anthracocarpon
  47. Anthracothecium
  48. Anzia
  49. Anzina
  50. Apatoplaca
  51. Aphanopsis
  52. Aplanocalenia
  53. Aptrootia
  54. Aquacidia[49]
  55. Architrypethelium
  56. Arctocetraria
  57. Arctomia
  58. Arctoparmelia
  59. Argopsis
  60. Aridoplaca[50]
  61. Arrhenia
  62. Arthonia (list)
  63. Arthopyrenia
  64. Arthotheliopsis
  65. Arthothelium
  66. Arthrorhaphis
  67. Arthrosporum
  68. Asahinea
  69. Aspicilia
  70. Aspiciliopsis
  71. Aspidothelium
  72. Aspilidea
  73. Asteristion
  74. Asteroporum
  75. Asterothyrium
  76. Astrochapsa
  77. Astrothelium
  78. Athallia
  79. Athelopsis
  80. Atla
  81. Atrophysma[51]
  82. Aulaxina
  83. Auriculora
  84. Australiaena
  85. Australidea[52]
  86. Austrella
  87. Austrographa
  88. Austrolecia
  89. Austromelanelixia[53][54]
  90. Austroparmelina
  91. Austropeltum
  92. Austroplaca
  93. Austroroccella
  94. Austrotrema
  95. Awasthia
  96. Awasthiella
  97. Bacidia
  98. Bacidina
  99. Bacidiopsora
  100. Bactrospora
  101. Baculifera
  102. Badimia
  103. Badimiella
  104. Baeomyces
  105. Baflavia
  106. Bagliettoa
  107. Bahianora
  108. Baidera[55]
  109. Bapalmuia
  110. Bartlettiella
  111. Barubria
  112. Bathelium
  113. Bellemerea
  114. Biatora
  115. Biatorella
  116. Biatoridium
  117. Bibbya[56]
  118. Bilimbia
  119. Blastenia
  120. Blastodesmia
  121. Blennothallia
  122. Bogoriella
  123. Boreoplaca
  124. Borinquenotrema
  125. Botryolepraria
  126. Bouvetiella
  127. Brasilicia
  128. Brianaria
  129. Brigantiaea
  130. Brodoa
  131. Brownliella
  132. Bryobilimbia
  133. Bryocaulon
  134. Bryodina
  135. Bryogomphus
  136. Bryonora
  137. Bryoplaca
  138. Bryoria
  139. Bryostigma
  140. Buellia (list)
  141. Buelliastrum
  142. Bulbothrix
  143. Bunodophoron
  144. Burrowsia[57]
  145. Byssolecania
  146. Byssoloma
  147. Byssotrema
  148. Caeruleum
  149. Calathaspis
  150. Calenia
  151. Caleniopsis
  152. Calicium
  153. Callome
  154. Calogaya
  155. Calopadia
  156. Calopadiopsis
  157. Caloplaca (list)
  158. Calotrichopsis
  159. Calvitimela
  160. Calycidium
  161. Cameronia
  162. Candelaria
  163. Candelariella
  164. Candelina
  165. Canoparmelia
  166. Caprettia
  167. Carassea
  168. Carbacanthographis
  169. Carbonicola
  170. Catapyrenium
  171. Catarrhospora
  172. Catarraphia
  173. Catenarina
  174. Catillaria
  175. Catillochroma
  176. Catinaria
  177. Catolechia
  178. Cecidonia
  179. Celothelium
  180. Cenozosia
  181. Cephalophysis
  182. Cerothallia
  183. Cetradonia
  184. Cetraria
  185. Cetrariella
  186. Cetrelia
  187. Cetreliopsis
  188. Chaenotheca
  189. Chapsa
  190. Charcotiana
  191. Cheiromycina
  192. Chiodecton
  193. Chrismofulvea
  194. Chromatochlamys
  195. Chroodiscus
  196. Chrysothrix
  197. Cinnabaria[58]
  198. Ciposia
  199. Circinaria
  200. Cladia
  201. Cladidium
  202. Claurouxia
  203. Cladonia (list)
  204. Clandestinotrema
  205. Clathroporina
  206. Clauzadea
  207. Clauzadeana
  208. Clauzadella
  209. Clavascidium
  210. Cliostomum
  211. Clypeopyrenis
  212. Coccocarpia
  213. Coccotrema
  214. Coelopogon
  215. Coenogonium
  216. Collema
  217. Collemopsidium
  218. Combea
  219. Compositrema
  220. Compsocladium
  221. Coniangium
  222. Coniarthonia
  223. Coniocarpon
  224. Conotremopsis
  225. Constrictolumina
  226. Coppinsia
  227. Coppinsidea[59]
  228. Cora
  229. Corella
  230. Coronoplectrum
  231. Cornicularia
  232. Corticorygma
  233. Corynecystis
  234. Coscinocladium
  235. Cratiria
  236. Creographa
  237. Crespoa
  238. Cresponea
  239. Cresporhaphis[42]
  240. Crocellina
  241. Crocodia
  242. Crocynia
  243. Cruentotrema
  244. Crustospathula
  245. Crutarndina
  246. Cryptodictyon
  247. Cryptodiscus
  248. Crypthonia
  249. Cryptophaea
  250. Cryptothecia
  251. Cryptothele
  252. Culbersonia
  253. Cyanoporina
  254. Cyphelium
  255. Cyphellostereum
  256. Cystocoleus
  257. Dacampia
  258. Dactylina
  259. Davidgallowaya
  260. Degelia
  261. Dendriscosticta
  262. Dendrographa
  263. Dermatiscum
  264. Dermatocarpon
  265. Dermiscellum
  266. Diaphorographis
  267. Dibaeis
  268. Dichosporidium
  269. Dictyocatenulata
  270. Dictyographa
  271. Dictyomeridium
  272. Dictyonema
  273. Digitothyrea
  274. Dijigiella[60][61]
  275. Dimelaena
  276. Dimidiographa
  277. Diorygma
  278. Diploicia
  279. Diploschistella
  280. Diploschistes
  281. Diplotomma
  282. Dirinaria
  283. Dirina
  284. Dirinastrum
  285. Diromma
  286. Distopyrenis
  287. Distothelia
  288. Dolichocarpus
  289. Dolichousnea[62][54]
  290. Ducatina[63][64]
  291. Dufourea
  292. Dyplolabia
  293. Echidnocymbium
  294. Echinoplaca
  295. Edrudia
  296. Edwardiella
  297. Eiglera
  298. Eilifdahlia
  299. Elixia
  300. Elixjohnia[65][61]
  301. Emmanuelia[66]
  302. Emodomelanelia
  303. Encephalographa
  304. Enchylium
  305. Endocarpon
  306. Endocena
  307. Endohyalina
  308. Enterodictyon
  309. Enterographa
  310. Epilichen
  311. Enigmotrema
  312. Eopyrenula
  313. Ephebe
  314. Eremastrella
  315. Eremithallus
  316. Eremothecella
  317. Erinacellus
  318. Erioderma
  319. Ertzia
  320. Erythrodecton
  321. Eschatogonia
  322. Esslingeriana
  323. Eugeniella
  324. Eumitria[62][54]
  325. Euopsis
  326. Evernia
  327. Everniopsis
  328. Farnoldia
  329. Fauriea
  330. Feigeana
  331. Felipes
  332. Fellhanera
  333. Fellhaneropsis
  334. Ferraroa
  335. Fibrillithecis
  336. Filsoniana
  337. Finkia
  338. Fissurina
  339. Flabelloporina[67]
  340. Flakea
  341. Flavobathelium
  342. Flavocetraria
  343. Flavoparmelia
  344. Flavoplaca
  345. Flavopunctelia
  346. Fluctua
  347. Follmannia
  348. Follmanniella
  349. Fominiella[68]
  350. Fouragea
  351. Franwilsia
  352. Frigidopyrenia
  353. Frutidella
  354. Fulgidea
  355. Fulvophyton
  356. Fuscidea
  357. Fuscoderma
  358. Fuscopannaria
  359. Gabura[42]
  360. Gassicurtia
  361. Gibbosporina
  362. Gintarasia
  363. Gintarasiella[69]
  364. Glaucotrema
  365. Gloeheppia
  366. Glomerilla
  367. Glomerulophoron
  368. Glyphis
  369. Glypholecia
  370. Glyphopeltis
  371. Glyphopsis
  372. Glysoplaca
  373. Gomphillus
  374. Gondwania
  375. Gorgadesia
  376. Gossypiothallon
  377. Gowardia
  378. Granulopyrenis
  379. Graphidastra
  380. Graphis
  381. Gregorella
  382. Gudelia
  383. Gyalecta
  384. Gyalectaria
  385. Gyalectidium
  386. Gyalidea
  387. Gyalideopsis
  388. Gyalolechia
  389. Gymnoderma
  390. Gymnographa
  391. Gymnographopsis
  392. Gyrocollema
  393. Gyrographa
  394. Gyronactis
  395. Gyrotrema
  396. Haematomma
  397. Halecania
  398. Halegrapha
  399. Halographis
  400. Haloplaca
  401. Hanstrassia[70]
  402. Haplodina
  403. Haploloma
  404. Harpidium
  405. Harusavskia[71]
  406. Heiomasia
  407. Helicobolomyces[72][73]
  408. Helminthocarpon
  409. Helocarpon
  410. Hemithecium
  411. Henrica
  412. Heppia
  413. Heppsora
  414. Herpothallon
  415. Hertella
  416. Herteliana
  417. Hertelidea
  418. Heterocarpon
  419. Heterocyphelium
  420. Heterodermia
  421. Heteromyces
  422. Heteroplacidium
  423. Himantormia
  424. Hippocrepidea
  425. Homothecium
  426. Hormosphaeria
  427. Hosseusia
  428. Hosseusiella[74]
  429. Huea
  430. Hueidea
  431. Huneckia
  432. Hydropunctaria
  433. Hymenelia
  434. Hyperphyscia
  435. Hypocenomyce
  436. Hypoflavia
  437. Hypogymnia
  438. Hypotrachyna
  439. Icmadophila
  440. Igneoplaca
  441. Ikaeria[75]
  442. Immersaria
  443. Imshaugia
  444. Ingaderia
  445. Ingvariella
  446. Inoderma
  447. Involucropyrenium
  448. Ionaspis
  449. Ioplaca
  450. Isalonactis
  451. Jamesiella
  452. Japewia
  453. Japewiella
  454. Jarmania
  455. Jasonhuria
  456. Jenmania
  457. Joergensenia
  458. Josefpoeltia
  459. Julella[42]
  460. Kaernefeltia
  461. Kaernefia
  462. Kalbiana
  463. Kalbionora[76][77]
  464. Kalbographa
  465. Kashiwadia
  466. Kantvilasia
  467. Klauskalbia[78]
  468. Knightiella[42]
  469. Koerberia
  470. Koerberiella
  471. Krogia
  472. Kroswia
  473. Kuettlingeria
  474. Kurokawia[79]
  475. Labyrintha
  476. Lambiella
  477. Lasallia
  478. Lasioloma
  479. Lathagrium
  480. Lazarenkoella
  481. Lecanactis
  482. Lecania
  483. Lecanographa
  484. Lecanora (list)
  485. Lecidea (list)
  486. Lecidella
  487. Lecidoma
  488. Lecidopyrenopsis
  489. Leciophysma
  490. Leifidium
  491. Leightoniella
  492. Leimonis
  493. Leioderma
  494. Leiorreuma
  495. Lemmopsis
  496. Lempholemma
  497. Lendemeriella
  498. Lepidocollema
  499. Lepidostroma
  500. Lepra
  501. Leprantha
  502. Lepraria
  503. Leprocaulon
  504. Leprocollema
  505. Leproplaca
  506. Leptochidium
  507. Leptogidium
  508. Leptogium
  509. Leptorhaphis
  510. Leptotrema
  511. Letharia
  512. Lethariella
  513. Letrouitia
  514. Leucodecton
  515. Leucodermia
  516. Lichenomphalia
  517. Lichina
  518. Lichinella
  519. Lichinodium
  520. Lignoscripta
  521. Lithoglypha
  522. Lithographa
  523. Lithogyalideopsis
  524. Lithothelium
  525. Llimonaea
  526. Lobaria
  527. Lobariella
  528. Lobarina
  529. Lobothallia
  530. Loekoesia
  531. Loflammia
  532. Loflammiopsis
  533. Logilvia
  534. Lopacidia
  535. Lopadium
  536. Lopezaria
  537. Loxospora
  538. Loxosporopsis
  539. Lueckingia
  540. Lyromma
  541. Magmopsis
  542. Malcolmiella
  543. Malmidea
  544. Malmographina
  545. Mangoldia
  546. Marcelaria
  547. Marchandiomphalina
  548. Marchantiana
  549. Marfloraea
  550. Maronea
  551. Maronella
  552. Maronina[62][80]
  553. Masonhalea
  554. Massalongia
  555. Mastodia
  556. Mawsonia
  557. Mazaediothecium
  558. Mazosia
  559. Megalaria
  560. Megaloblastenia
  561. Megalospora
  562. Megalotremis
  563. Megaspora
  564. Melanelia
  565. Melanelixia
  566. Melanohalea
  567. Melanolecia
  568. Melanophloea
  569. Melanotopelia
  570. Melanotrema
  571. Melarthonis
  572. Melaspilea
  573. Menegazzia (list)
  574. Meridianelia
  575. Metamelanea
  576. Metus
  577. Micarea
  578. Microtheliopsis
  579. Milospium
  580. Miltidea
  581. Minksia
  582. Miriquidica
  583. Mischoblastia
  584. Mobergia
  585. Monerolechia
  586. Monoblastia
  587. Montanelia
  588. Moriola
  589. Multiclavula
  590. Multisporidea[81]
  591. Mycobilimbia
  592. Mycoblastus
  593. Mycoporum
  594. Myelochroa
  595. Myeloconis
  596. Myelorrhiza
  597. Myriolecis
  598. Myrionora
  599. Myriospora
  600. Myriostigma
  601. Myochroidea
  602. Nadvornikia
  603. Nebularia
  604. Neobrownliella[82]
  605. Neocatapyrenium
  606. Neophyllis
  607. Neopsoromopsis
  608. Neosergipea
  609. Nephroma
  610. Nephromopsis
  611. Nevesia
  612. Niebla
  613. Nigrovothelium
  614. Nipponoparmelia
  615. Nitidochapsa
  616. Nodobryoria
  617. Normandina
  618. Notocladonia
  619. Notolecidea
  620. Notoparmelia
  621. Novomicrothelia
  622. Nyungwea
  623. Obscuroplaca[83]
  624. Ocellomma
  625. Ocellularia (list)
  626. Ochrolechia
  627. Oevstedalia
  628. Olegblumia
  629. Oletheriostrigula
  630. Omphalodium
  631. Omphalora
  632. Opegrapha
  633. Opeltia[84]
  634. Ophioparma
  635. Orceolina
  636. Orcularia
  637. Orientophila
  638. Oropogon
  639. Orphniospora
  640. Oxnerella
  641. Pachnolepia
  642. Pachyascus
  643. Pachypeltis
  644. Pachyphysis
  645. Palicella
  646. Pallidogramme
  647. Pannaria
  648. Pannoparmelia
  649. Parabagliettoa
  650. Paracollema
  651. Paragyalideopsis[85][86]
  652. Paraingaderia
  653. Parainoa
  654. Paraporpidia
  655. Paraschismatomma
  656. Parasiphula
  657. Paratopeliopsis
  658. Paratricharia
  659. Parmelia
  660. Parmeliella
  661. Parmelina
  662. Parmelinella
  663. Parmeliopsis
  664. Parmostictina
  665. Parmotrema (list)
  666. Parmotremopsis
  667. Parvoplaca
  668. Paulia
  669. Peccania
  670. Pectenia
  671. Peltigera
  672. Peltula
  673. Peltularia
  674. Pentagenella
  675. Pertusaria (list)
  676. Petractis
  677. Phaeographis
  678. Phaeographopsis
  679. Phaeophyscia
  680. Phaeorrhiza
  681. Phloeopeccania
  682. Phlyctis
  683. Phoebus
  684. Phylliscidium
  685. Phyllisciella
  686. Phylliscidiopsis
  687. Phylliscum
  688. Phyllobaeis
  689. Phyllobathelium
  690. Phylloblastia
  691. Phyllocratera
  692. Phyllogyalidea
  693. Phyllopsora
  694. Physcia
  695. Physcidia
  696. Physciella
  697. Physconia
  698. Physma
  699. Piccolia
  700. Pilophorus
  701. Placidiopsis
  702. Placidium
  703. Placocarpus
  704. Placolecis
  705. Placomaronea
  706. Placopsis
  707. Placopyrenium
  708. Placothelium
  709. Placynthiella
  710. Placynthiopsis
  711. Placynthium
  712. Platismatia
  713. Platygramme
  714. Platythecium
  715. Plectocarpon
  716. Pleopsidium
  717. Pleurosticta
  718. Pliariona
  719. Podostictina
  720. Podotara
  721. Poeltiaria
  722. Poeltidea
  723. Poeltinula
  724. Polistroma
  725. Polyblastia
  726. Polyblastidium
  727. Polycauliona
  728. Polychidium
  729. Polymeridium
  730. Polypyrenula
  731. Polysporina
  732. Porina
  733. Porocyphus
  734. Porpidia
  735. Porpidinia[42]
  736. Protoblastenia
  737. Protomicarea
  738. Protopannaria
  739. Protoparmelia
  740. Protoparmeliopsis
  741. Protoroccella[42]
  742. Protothelenella
  743. Protousnea
  744. Psammina
  745. Psathyrophlyctis
  746. Pseudarctomia
  747. Pseudephebe
  748. Pseudevernia
  749. Pseudobaeomyces
  750. Pseudocalopadia
  751. Pseudochapsa
  752. Pseudocyphellaria
  753. Pseudohepatica
  754. Pseudoheppia
  755. Pseudolecanactis
  756. Pseudoleptogium
  757. Pseudopannaria
  758. Pseudoparmelia
  759. Pseudopaulia
  760. Pseudopeltula
  761. Pseudopyrenula
  762. Pseudoramonia
  763. Pseudosagedia
  764. Pseudoschismatomma
  765. Pseudothelomma
  766. Pseudotopeliopsis
  767. Psilolechia
  768. Psiloparmelia
  769. Psora
  770. Psorinia
  771. Psoroglaena
  772. Psoroma
  773. Psoromella
  774. Psoromidium[42]
  775. Psoronactis
  776. Psorotheciopsis
  777. Psorotichia
  778. Psorula
  779. Pterygiopsis
  780. Ptychographa
  781. Pulvinodecton
  782. Pulvinora[87]
  783. Punctelia
  784. Punctonora
  785. Puttea
  786. Pycnora
  787. Pycnothelia
  788. Pycnotrema
  789. Pyrenocarpon
  790. Pyrenocollema
  791. Pyrenodesmia
  792. Pyrenopsis
  793. Pyrenothrix
  794. Pyrenowilmsia
  795. Pyrenula (list)
  796. Pyrgillus
  797. Pyrrhospora
  798. Pyxine
  799. Racodium
  800. Racoleus
  801. Raesaeneniana
  802. Ramalea
  803. Ramalina
  804. Ramalodium
  805. Ramboldia
  806. Ramonia
  807. Redingeria
  808. Redonia
  809. Redonographa
  810. Rehmanniella[88]
  811. Reichlingia
  812. Reimnitzia
  813. Relicina
  814. Remototrachyna
  815. Requienella
  816. Rhabdodiscus
  817. Rhabdopsora
  818. Rhaphidicyrtis
  819. Rhexophiale
  820. Rhizocarpon
  821. Rhizolecia
  822. Rhizoplaca
  823. Ricasolia
  824. Rimularia
  825. Rinodina (list)
  826. Rinodinella
  827. Robergea
  828. Roccella
  829. Roccellographa
  830. Roccellina
  831. Roccellinastrum
  832. Rockefellera[89]
  833. Rolfidium
  834. Rolueckia
  835. Romjularia
  836. Ropalospora
  837. Rostania
  838. Rubrotricha
  839. Rufoplaca
  840. Rusavskia
  841. Sagedia
  842. Sagema
  843. Sagenidiopsis
  844. Sagiolechia
  845. Sanguinotrema
  846. Santessonia
  847. Sarcographa
  848. Sarcographina
  849. Sarcogyne
  850. Sarcosagium
  851. Sarea
  852. Sarrameana
  853. Savoronala
  854. Schadonia
  855. Schaereria
  856. Schismatomma
  857. Schistophoron
  858. Schizodiscus
  859. Schizopelte
  860. Schizotrema
  861. Schizoxylon
  862. Sclerococcum
  863. Sclerophora
  864. Sclerophyton
  865. Scleropyrenium
  866. Scoliciosporum
  867. Sculptolumina
  868. Scutaria
  869. Scytinium
  870. Sedelnikovaea
  871. Segestria
  872. Seirophora
  873. Semigyalecta
  874. Semiomphalina
  875. Septotrapelia
  876. Servitia
  877. Shackletonia
  878. Sigridea
  879. Simonyella
  880. Sipmaniella
  881. Siphula
  882. Siphulastrum
  883. Siphulella
  884. Sipmania
  885. Sirenophila
  886. Snippocia[90][73]
  887. Solenopsora
  888. Solitaria
  889. Solorina
  890. Solorinaria
  891. Sparria
  892. Speerschneidera
  893. Sphaerophorus
  894. Sphaerophoropsis
  895. Spheconisca
  896. Sphinctrinopsis
  897. Spilonema
  898. Sporastatia
  899. Sporodictyon
  900. Sporodophoron
  901. Sporopodiopsis
  902. Sporopodium
  903. Sporostigma
  904. Sprucidea[91][80]
  905. Squamarina
  906. Squamella
  907. Squamulea
  908. Staurospora[92][93]
  909. Staurolemma
  910. Staurothele
  911. Stegobolus
  912. Steinera
  913. Steineropsis
  914. Steinia
  915. Stellarangia
  916. Stenhammarella
  917. Stephanocyclos
  918. Stereocaulon
  919. Sticta
  920. Stictis
  921. Stigmatochroma
  922. Stigmidium
  923. Strangospora
  924. Streimannia
  925. Streimanniella
  926. Stirtonia
  927. Stirtoniella
  928. Strigula
  929. Stromatella
  930. Sulcaria
  931. Sulcopyrenula
  932. Sulzbacheromyces
  933. Synalissa
  934. Synarthonia
  935. Synarthothelium
  936. Syncesia
  937. Szczawinskia
  938. Tania
  939. Tapellaria
  940. Tapellariopsis
  941. Tarasginia
  942. Tarbertia
  943. Tasmidella
  944. Tassiloa
  945. Tayloriellina
  946. Teloschistes
  947. Teloschistopsis
  948. Tenuitholiascus[94][45]
  949. Tephromela
  950. Tetramelas
  951. Teuvoa
  952. Texosporium
  953. Thallinocarpon
  954. Thalloloma
  955. Thamnochrolechia
  956. Thamnolecania
  957. Thamnolia
  958. Thecaria
  959. Thecographa
  960. Thelenella
  961. Thelenidia
  962. Thelidiopsis
  963. Thelignya
  964. Thelliana
  965. Thelocarpon
  966. Thelomma
  967. Thelopsis
  968. Thelotrema
  969. Thermutis
  970. Thermutopsis
  971. Tholurna
  972. Thrombium
  973. Thyrea
  974. Thysanothecium
  975. Tibellia
  976. Timdalia
  977. Tingiopsidium
  978. Toensbergia
  979. Toninia
  980. Toniniopsis
  981. Topelia
  982. Topeliopsis
  983. Tornabea
  984. Trapelia
  985. Trapeliopsis
  986. Traponora
  987. Tremolecia
  988. Tremotylium[42]
  989. Tricharia
  990. Trichothelium
  991. Trimmatothele
  992. Trimmatothelopsis
  993. Trinathotrema
  994. Trizodia
  995. Trypetheliopsis
  996. Trypethelium
  997. Tuckermanella
  998. Tuckermanopsis
  999. Tylophorella
  1000. Tylophoron
  1001. Tylophoropsis
  1002. Tylothallia
  1003. Umbilicaria
  1004. Upretia[95]
  1005. Usnea
  1006. Usnocetraria
  1007. Usnochroma
  1008. Vahliella
  1009. Vainionora
  1010. Varicellaria
  1011. Variospora
  1012. Verrucaria (list)
  1013. Verruculopsis
  1014. Verseghya[96]
  1015. Vezdaea
  1016. Vigneronia
  1017. Villophora
  1018. Violella
  1019. Viridothelium
  1020. Vulpicida
  1021. Wadeana
  1022. Wahlenbergiella
  1023. Watsoniomyces[97]
  1024. Wawea
  1025. Waynea
  1026. Wetmoreana
  1027. Willeya
  1028. Wirthiotrema
  1029. Xalocoa
  1030. Xanthocarpia
  1031. Xanthomendoza
  1032. Xanthoparmelia (list)
  1033. Xanthopeltis
  1034. Xanthopsorella
  1035. Xanthoria
  1036. Xenolecia
  1037. Xenus
  1038. Xyleborus
  1039. Xylographa
  1040. Xyloschistes
  1041. Xylopsora
  1042. Yarrumia
  1043. Yoshimuria
  1044. Yoshimuriella
  1045. Zahlbrucknerella
  1046. Zeroviella
  1047. Zwackhia

Species

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In 2009, taxonomists estimated that the total number of lichen species (including those yet undiscovered) might be as high as 28,000.[98] By 2016, 19,387 species of lichens had been described and widely accepted.[99]

Lichens, by growth form

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Xanthoria parietina has the leafy-looking growth of a foliose lichen.[100]

Lichen growth forms – These vary depending on the species:

Lichens, by substrate

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Saxicolous lichens are those which grow on stone.[109]

Lichens can be classified by the substrate on which they grow:

Lichens, by region

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Namibia's vast deserts, which hold many species of lichen, remain largely unsurveyed.[115]

Africa

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Antarctica

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Asia

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Australia

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Europe

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North America

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Oceania

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Pacific

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South America

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Photobiont

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The photobiont in most lichens is a green alga, particularly those from the genus Trebouxia.[6]

Photobiont – the photosynthetic partner in a lichen.[116]

Lichen metabolites

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Lichen product – organic products, known as secondary metabolites, produced by lichens; these provide a variety of protections for the lichen – from microbes, viruses, herbivores, radiation, oxidants and more.[118]

 
Chemical spot tests on the foliose lichen Punctelia borreri showing thallus (top) and medulla (bottom). The pinkish-red colour change of the medulla in the C and KC tests indicate the presence of gyrophoric acid, a chemical feature that helps to distinguish this lichen from similar species in the same genus.[119]

Study of lichens

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Lichenology – the study of lichens.[120]

Threats

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Lichens in culture

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Two baked loaves of Bryoria fremontii, an important traditional food for some First Nations people[129]

Lichen organizations

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  • Herzogia – peer-reviewed journal published by BLAM.
  • Lindbergia – peer-reviewed journal co-published by the Dutch Bryological and Lichenological Society and the Nordic Bryological Society.

Independent lichenological journals

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See also

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Citations

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  1. ^ a b Van Hoose 2021.
  2. ^ Cambridge Dictionary.
  3. ^ a b Favor 2005, p. 5.
  4. ^ Laundon 1986, p. 3.
  5. ^ Li et al. 2021, p. evab101.
  6. ^ a b c Purvis 2000, p. 9.
  7. ^ a b Laundon 1986, p. 2.
  8. ^ Honegger 1998, p. 197.
  9. ^ a b Brodo, Sharnoff & Sharnoff 2001, p. 758.
  10. ^ Baron 1999, p. 14.
  11. ^ Hawksworth, Sutton & Ainsworth 1983, p. 26.
  12. ^ Silverstein, Silverstein & Silverstein 1996, p. 32.
  13. ^ Smith et al. 2009, p. 22.
  14. ^ Smith et al. 2009, p. 30.
  15. ^ Brodo, Sharnoff & Sharnoff 2001, p. 756.
  16. ^ Hale 1983, pp. 3, 6.
  17. ^ Smith et al. 2009, p. 36.
  18. ^ Smith et al. 2009, p. 24.
  19. ^ Hawksworth, Sutton & Ainsworth 1983, p. 330.
  20. ^ a b Smith et al. 2009, p. 38.
  21. ^ Brodo, Sharnoff & Sharnoff 2001, p. 763.
  22. ^ a b Brodo, Sharnoff & Sharnoff 2001, p. 757.
  23. ^ Brodo, Sharnoff & Sharnoff 2001, p. 759.
  24. ^ Brodo, Sharnoff & Sharnoff 2001, p. 760.
  25. ^ Brodo, Sharnoff & Sharnoff 2001, p. 761.
  26. ^ a b Henriksson & Simu 1971, p. 119.
  27. ^ Smith et al. 2020, p. 134.
  28. ^ Bowler & Rundel 1975, p. 328.
  29. ^ Bowler & Rundel 1975, p. 326–327.
  30. ^ Galloway 2012, p. 315.
  31. ^ Zakeri et al. 2022, p. 80.
  32. ^ Chen, Blume & Beyer 2000, p. 124.
  33. ^ Green et al. 2018, p. 397.
  34. ^ a b c d Wijayawardene et al. 2022.
  35. ^ a b c Lücking, Hodkinson & Leavitt 2016, p. 377–400.
  36. ^ Bendre 2010, p. 131.
  37. ^ Lepp 2014.
  38. ^ a b c Lücking, Hodkinson & Leavitt 2016, p. 371.
  39. ^ a b Kraichak et al. 2018a.
  40. ^ a b Kraichak et al. 2018b.
  41. ^ a b c d Wijayawardene et al. 2022, p. 162.
  42. ^ a b c d e f g h i j k Lücking, Hodkinson & Leavitt 2017, p. 58.
  43. ^ Gamundí & Spinedi 1985, p. 112.
  44. ^ Jiang et al. 2020, p. 11.
  45. ^ a b Wijayawardene et al. 2022, p. 124.
  46. ^ Lendemer, Harris & Ruiz 2016, p. 26.
  47. ^ Lücking & Kalb 2018, p. 353.
  48. ^ Wilk et al. 2021, p. 289.
  49. ^ Aptroot, Sparrius & Alvarado 2018, p. 12.
  50. ^ Wilk et al. 2021, p. 292.
  51. ^ Spribille et al. 2020, p. 85.
  52. ^ Kantvilas, Wedin & Svensson 2021, p. 400.
  53. ^ Divakar et al. 2017, p. 110.
  54. ^ a b c Wijayawardene et al. 2022, p. 150.
  55. ^ Diederich & Ertz 2020, p. 22.
  56. ^ Kistenich et al. 2018, p. 871.
  57. ^ Fryday et al. 2020, p. 473.
  58. ^ Wilk et al. 2021, p. 293.
  59. ^ Kondratyuk et al. 2019, p. 295.
  60. ^ Kondratyuk et al. 2017, p. 79.
  61. ^ a b Wijayawardene et al. 2022, p. 156.
  62. ^ a b c Divakar et al. 2017, p. 109.
  63. ^ Ertz et al. 2017, p. 131.
  64. ^ Wijayawardene et al. 2022, p. 159.
  65. ^ Kondratyuk et al. 2017, p. 86.
  66. ^ Simon et al. 2020, p. 82.
  67. ^ Sobreira et al. 2018, p. 67.
  68. ^ Kondratyuk et al. 2017, p. 87.
  69. ^ Kondratyuk et al. 2017, p. 90.
  70. ^ Kondratyuk et al. 2017, p. 91.
  71. ^ Kondratyuk et al. 2017, p. 96.
  72. ^ Grube, Matzer & Hafellner 1995, p. 28.
  73. ^ a b Wijayawardene et al. 2022, p. 89.
  74. ^ Kondratyuk et al. 2018, p. 97.
  75. ^ Kondratyuk et al. 2017, p. 105.
  76. ^ Wijayawardene et al. 2022, p. 98.
  77. ^ Sodamuk et al. 2017, p. 15.
  78. ^ Kondratyuk et al. 2021, p. 372.
  79. ^ Kondratyuk et al. 2021, p. 375.
  80. ^ a b Wijayawardene et al. 2022, p. 149.
  81. ^ Kalb & Aptroot 2021, p. 5.
  82. ^ Kondratyuk et al. 2015, p. 328.
  83. ^ Bungartz, Søchting & Arup 2021.
  84. ^ Kondratyuk et al. 2017, p. 112.
  85. ^ Etayo 2017, p. 335.
  86. ^ Wijayawardene et al. 2022, p. 160.
  87. ^ Davydov et al. 2021, p. 245.
  88. ^ Kondratyuk et al. 2018, p. 107.
  89. ^ Lendemer, Stone & Tripp 2017, p. 459.
  90. ^ Ertz et al. 2018, p. 170.
  91. ^ Cáceres et al. 2017, p. 206.
  92. ^ Wijayawardene et al. 2022, p. 38.
  93. ^ Grube 2018, p. 695.
  94. ^ Jiang et al. 2020, p. 1.
  95. ^ Kondratyuk et al. 2018, p. 24.
  96. ^ Kondratyuk et al. 2016, p. 104.
  97. ^ Díaz-Escandón et al. 2021, p. 501.
  98. ^ Lücking et al. 2009, p. 411.
  99. ^ Lücking, Hodkinson & Leavitt 2016, p. 370.
  100. ^ Dobson 2011, p. 470.
  101. ^ Brodo, Sharnoff & Sharnoff 2001, p. 16.
  102. ^ a b c d e The British Lichen Society 2022a.
  103. ^ Temu et al. 2019, p. 1.
  104. ^ Kantvilas 1996, p. 229.
  105. ^ Dobson 2011, p. 26.
  106. ^ Sanders 2001, p. 1033.
  107. ^ Brodo, Sharnoff & Sharnoff 2001, p. 17.
  108. ^ Brodo, Sharnoff & Sharnoff 2001, p. 18.
  109. ^ a b c d e f g The British Lichen Society 2022b.
  110. ^ Lendemer, Buck & Harris 2016, p. 441.
  111. ^ a b c d Upreti & Rai 2013, p. 2.
  112. ^ a b Lücking 2008, p. 4.
  113. ^ Lücking 1998, p. 287.
  114. ^ Rosentreter 1993, p. 333.
  115. ^ Schultz, Zedda & Rambold 2009, p. 315.
  116. ^ Purvis 2000, p. 5.
  117. ^ Rikkinen 2015, p. 973.
  118. ^ Goga et al. 2018, p. 1.
  119. ^ Truong & Clerc 2003, p. 52.
  120. ^ Merriam-Webster.
  121. ^ International Association for Lichenology.
  122. ^ Pfister 1985, p. 1.
  123. ^ Brodo, Sharnoff & Sharnoff 2001, p. 84.
  124. ^ Brodo, Sharnoff & Sharnoff 2001, p. 103.
  125. ^ Lawrey & Diederich 2003, p. 80.
  126. ^ Nimis, Scheidegger & Wolseley 2002.
  127. ^ Oliver 2011, p. 1.
  128. ^ Field Museum 2022.
  129. ^ Turner 1977, p. 461.
  130. ^ Penguin Books.
  131. ^ Ivanova & Ivanov 2009, p. 11.
  132. ^ Vinayaka & Krishnamurthy 2012, p. 265.

References

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