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Aspicilia phaea
''Aspicilia phaea'' (dusky sunken disk lichen) is a grayish brown to tan areolate crustose lichen commonly found on rock in coastal to inland parts of central and southern California. Described as new to science in 2007,〔Field Guide to California Lichens, Stephen Sharnoff, Yale University Press, 2014, ISBN 978-0-300-19500-2〕〔Lichen Flora of the Greater Sonoran Desert Region. Vol 3, Nash, T.H., Ryan, B.D., Gries, C., Bugartz, F., (eds.) 2001, ()〕 it is endemic to (only found in) California.〔The Lichen Flora of Joshua Tree National Park An Annotated Checklist, Kerry Knudsen, Mitzi Harding, Josh Hoines, National Park Service, ()〕 It grows on exposed or partially shaded siliceous rock, with a few known occurrences on serpentine rock.〔
In rare cases full areolas do not form, and it appears as being cracked (rimose).〔〔 There are often grayish or whitish spots on the areolas.〔 The thallus is 2–8 cm in diameter, and 0.1– 1.2 mm thick.〔 The areolas are irregularly sized and angular, giving the lichen body (thallus) the appearance of a mosaic of small polygons.〔〔 A rim of dark tissue (prothallus) may surround the edges of the lichen.〔〔 The fruiting body parts (apothecia) are flat to concave (especially in the thallus center), and slightly immersed in the thallus, appearing as sunken round to polygonal discs, often with a grey or white rim of thalline tissue.〔〔 Lichen spot tests are all negative (K-, C-, KC-, P-).〔〔
The photobiont is a chlorococcoid.〔 In Joshua Tree National Park, it is commonly found to be infected with ''Lichenostigma'', a genus or lichenicolous fungi (fungi that are parasitic on lichens).〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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