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 Thallus: peltate, scattered, individual thalli up to 22 mm in diam., often lobate; margin: undulate; upper surface: gray, pruinose, spot-like; soredia: farinose, black, marginal, rarely occurring; upper cortex: with numerous air spaces, 4.5-13 µm thick and with an epinecral layer (7-18 µm thick); medulla: composed of loosely interwoven hyphae with elongated cells (2-3.6 µm thick); algal layer: clearly delimited above, 55-100 µm thick; lower cortex: paraplectenchymatous, 24-37 µm thick, composed of 3 (rarely 4) rows of hexagonal cells (4.5-7.5 µm in diam.), in 4-5 rows; lower surface: pale orange-brown, attached by an umbilicus; Apothecia: rare (only one found in material from Sinaloa), one to presumably several, immersed with an orange colored; disc: slightly protruding when mature; asci: obclavate, I- (but the material was to scanty to be sure!); ascospores: numerous (>64) in asci, ellipsoid to bacilliform, 4.4-8 x 2.9-4.4 µm; Pycnidia: not observed; Spot tests: all negative; Secondary metabolites: none detected.; Substrate and ecology: on acidic rocks and drainage areas where calcium may accumulate in secondary deposits; World distribution: South Africa, Pakistan, SW North America; Sonoran distribution: desert and other semiarid areas of Arizona, California, Sonora, Chihuahua and Sinaloa. 


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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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