Acarospora fuscata
# 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 $elevations.^{:217}$ It grows in Europe and North America. It grows in southern California and on the eastern part of the Sierra Nevada $range.^{:217}$ It may grow with the areolas $disconnected.^{:217}$ The areolas may lift at the edges, but the areolas do not overlap like true squamules $(sub-squamulose).^{:217}$ More common in the Sierras is the similar species Acarospora thamnina, which is truly squamulose with overlapping $scales.^{:217}$

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. Lichen spot tests are K−, C+ vaguely pink, KC+ red, and $P−.^{:217}$ Secondary metabolites include gyrophoric acid.

