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 Thallus: umbilicate, usually monophyllous to almost polyphyllous, lobate, soft, thin, often with a lacerated margin, 2-5(-12) cm in diam.; upper surface: light gray to light green, smooth initially but developing a fine network of fissures, dissolving into patchy or flake-like soredia marginally; medulla: white; lower surface: white to pink, covered densely with long, often darker centrally, slender, slightly branched rhizionomorphs (hirsutus = hairy); Apothecia: not common, black, sessile to stipitate, gyrose, up to 2 mm in diam.; asci: clavate, 8-spored; ascospores: hyaline, simple, ellipsoid, 10-14 x 4-8 µm; Spot tests: medulla K-, C+ red , KC+ red P-; Secondary metabolites: gyrophoric and lecanoric acids.; Substrate and ecology: on silicious rocks in boreal zone, mostly on steeply inclined surfaces which regularly have seeping water; hygrophilic; World distribution: Europe, Asia, and North America; Sonoran distribution: rare in southern California.; Notes: Umbilicaria hirsuta is the only species of Umbilicaria in the Sonoran region that reproduce primarily by soredia. 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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