Collema nigrescens
| Collema nigrescens | |
|---|---|
| Scientific classification | |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Lecanoromycetes |
| Order: | Lecanorales |
| Family: | Collemataceae |
| Genus: | Collema |
| Species: | C. nigrescens |
| Binomial name | |
| Collema nigrescens | |
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.[1]:34, 36 It is commonly called button jelly lichen or bat's wing lichen.[1]:34, 36 It is blackish-green when wet, and dark brownish-green to dark olive when dry.[1]:34, 36 The photosyntheic partner is the Nostoc cyanobacterium that is spread throughout the thallus (main body part).[1]:34, 36 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.[1]:34, 36 It has dark purple-brown apothecia all over.[1]:34, 36 It produces no reaction to lichen spot tests.[1]:34, 36