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[[File:Penicillium Spp..jpg|thumb|''Penicillium'' sp. under bright field microscopy (10 × 100 magnification) with lactophenol cotton blue stain]]
The [[thallus]] ([[mycelium]]) consists of highly branched networks of [[multinucleated]], usually colourless [[hyphae]], with each pair of cells separated by a [[septum]]. [[Conidiophores]] are at the end of each branch accompanied by green spherical constricted units called [[conidia]]. These propagules play a significant role in reproduction; conidia are the main dispersal strategy of these fungi.<ref>{{Cite journal|last=Pitt|first=J.|date=1985|title=A laboratory guide to common Penicillium species|url=https://www.semanticscholar.org/paper/A-laboratory-guide-to-common-Penicillium-species-Pitt/7c86b2f5283c16d926fa93de64ef535040eec860?p2df| volume=79 |page=491 | doi=10.2307/3807483|jstor=3807483|s2cid=84610634}}</ref>
Sexual reproduction involves the production of [[ascospore]]s, commencing with the fusion of an [[archegonium]] and an [[antheridium]], with sharing of nuclei. The irregularly distributed [[ascus|asci]] contain eight unicellular ascospores each.
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