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Collema nigrescens
in Northwestern California
Scientific classification
Domain:	Eukaryota
Kingdom:	Fungi
Division:	Ascomycota
Class:	Lecanoromycetes
Order:	Peltigerales
Family:	Collemataceae
Genus:	Collema
Species:	C. nigrescens
Binomial name
Collema nigrescens (Huds.) DC. (1805)
Synonyms
Lichen nigrescens Huds. (1762)

Collema nigrescens is a leafy (foliose) jelly lichen (Collema genus) found growing on the bark of trees such as bigleaf maples, in wetter coastal parts of California. It is commonly called button jelly lichen or bat's wing lichen. It is blackish-green when wet, and dark brownish-green to dark olive when dry. The photosynthetic partner is the Nostoc cyanobacterium that is spread throughout the thallus (main body part). Although foliose in form, like all jelly lichens, the thallus is not differentiated, lacking layers or an upper or lower cortex (lichen) and the cyanobacteria is spread throughout the thallus. It has dark purple-brown apothecia all over. It produces no reaction to lichen spot tests.

References

1. ^ Field Guide to California Lichens, Stephen Sharnoff, Yale University Press, 2014, ISBN 978-0-300-19500-2

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• Peltigerales
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• Lichens of North America
• Taxa named by William Hudson (botanist)
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