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.[2]:217[3] It grows in Europe and North America.[3] It grows in southern California and on the eastern part of the Sierra Nevada range.[2]:217 It may grow with the areolas disconnected.[2]:217 The areolas may lift at the edges, but the areolas do not overlap like true squamules (sub-squamulose).[2]:217 More common in the Sierras is the similar species Acarospora thamnina, which is truly squamulose with overlapping scales.[2]:217

Acarospora fuscata

Acarospora fuscata
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[1]
  • 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.[3] Lichen spot tests are K-, C+ vaguely pink, KC+ red, and P-.[2]:217[3] Secondary metabolites include gyrophoric acid.[3]

References
  1. "Acarospora fuscata (Nyl.) Th. Fr". Species Fungorum. CAB International. Retrieved 2014-10-09.
  2. Field Guide to California Lichens, Stephen Sharnoff, Yale University Press, 2014, ISBN 978-0-300-19500-2
  3. Lichen Flora of the Greater Sonoran Desert Region. Vol 3., Nash, T.H., Ryan, B.D., Gries, C., Bugartz, F., (eds.) 2001,


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