Acarospora fuscata

Acarospora fuscata ("brown cobblestone lichen") is a glossy pale or yellowish-brown areolate lichen with angular areolas that grows up to 10 cm (4 in) wide on non-calcareous rock in low and high elevations.^{[3]: 217 [4]} It grows in Europe and North America.^[4] It grows in southern California and on the eastern part of the Sierra Nevada range.^[3]: 217 It may grow with the areolas disconnected.^[3]: 217 The areolas may lift at the edges, but the areolas do not overlap like true squamules (sub-squamulose).^[3]: 217 More common in the Sierras is the similar species Acarospora thamnina, which is truly squamulose with overlapping scales.^[3]: 217

Acarospora fuscata

Acarospora fuscata
Conservation status
Secure  (NatureServe)[1]
Scientific classification
Kingdom:	Fungi
Division:	Ascomycota
Class:	Lecanoromycetes
Order:	Acarosporales
Family:	Acarosporaceae
Genus:	Acarospora
Species:	A. fuscata
Binomial name
Acarospora fuscata (Nyl.) Th.Fr. (1871)
Synonyms[2]
Lichen fuscatus Schrad. (1794) Lecanora badia var. fuscata Ach. (1810) Lecanora fuscata Röhl. (1813) Lecanora fuscata Nyl. (1863) Acarospora veronensis var. fuscata (Nyl.) Arnold (1870)

It usually has 0-1 apothecium per areole, which may be point-like (punctiform) or fill the entire areole with a disc that is rough surfaced and reddish brown. The asci are club shaped (clavate), with over 100 spores.^[4] Lichen spot tests are K−, C+ vaguely pink, KC+ red, and P−.^{[3]: 217 [4]} Secondary metabolites include gyrophoric acid.^[4]