Chrysothrix granulosa
| Coastal gold dust lichen | |
|---|---|
| Scientific classification | |
| Kingdom: | Fungi |
| Phylum: | Ascomycota |
| Subdivision: | Pezizomycotina |
| Class: | Arthoniomycetes |
| Order: | Arthoniales |
| Family: | Chrysotrichaceae |
| Genus: | Chrysothrix |
| Species: | C. granulosa |
| Binomial name | |
| Chrysothrix granulosa | |
Chrysothrix granulosa (Coastal gold dust lichen) is a brilliant yellow, powdery (leprose) lichen that grows in irregular patches mostly on bark (sometimes wood and rock) in shaded dry areas of coastal western North America and western South America.[1]:253-4[2]
In North America it is found from Mexico to as far north as British Columbia.[1] It can be found in coastal areas of California[1] near Santa Barbara County,[2] and coastal areas of the Sonoran Desert, mostly islands off Baja California.[2] In South America it is found from Chile to Peru.[2] It is found at elevations from sea-level to 400 metres (1,300 ft).[2]
The mostly structureless body (thallus) forms powdery cushions of lichen granules (soredia) over a fluffy middle layer (medulla).[1] The upper medulla is yellow fading to yellow-white in the lower part.[2] It lacks fruiting bodies (apothecia).[1] Fruiting bodies (apothecia are absent in populations in California and the Sonoran Desert, and elsewhere have a constricted base with 0.2 to 1 mm diameter brownish orange flat to convex discs.[2]
Lichen spot tests are K+ orange, C-, KC-, and P+ orange, with UV+ a dullish dark orange.[1] Secondary metabolites include calycin acid and diffractaic acid.[1]