Thallus: peltate, scattered individually, sometimes lobed (rarely polyphyllous), up to 12 mm in diam.; margins: downrolled, not undulate; upper surface: tan-olive-green to dark olive-brown, dull to shiny; soredia: farinose, black, marginal (rarely laminal), in elongated soralia; upper cortex: lacking but with a yellow to brownish epinecral layer (5-10 µm thick); ...more ↓
Thallus: peltate, scattered individually, sometimes lobed (rarely polyphyllous), up to 12 mm in diam.; margins: downrolled, not undulate; upper surface: tan-olive-green to dark olive-brown, dull to shiny; soredia: farinose, black, marginal (rarely laminal), in elongated soralia; upper cortex: lacking but with a yellow to brownish epinecral layer (5-10 µm thick); medulla: composed of loosely interwoven hyphae (cells: elongated, 1.5-3 µm thick); algal layer: clearly delimited, 70-150 µm thick; lower cortex: 18-90 µm thick, proso- to paraplectenchymatous, hyphae often anticlinally arranged; cells: globose to elongated, 3-8 µm thick; lower surface: paler than the upper surface, attached by an umbilicus; Apothecia: rare, many per squamule, immersed; disc: punctiform to widely expanded, 0.1-0.9 mm diam.; epihymenium: yellowish brown or pinkish, K-; hymenium: I+ wine-red, 105-220 µm high; asci: clavate to obclavate; wall: I+ slightly blue and more strongly blue after pretreatment with K, 32-100-spored; ascospores: ellipsoid to bacilliform, 6-9 x 3-4.8 µm; Pycnidia: immersed, chambered, up to 150 µm diam.; conidia: fusiform, 3-3.5 x 1-1.5 µm; Spot tests: all negative; Secondary metabolites: none detected.; Substrate and ecology: on acidic rocks in deserts and other open, arid habitats; World distribution: throughout arid and semi-arid regions on all continents and extending into temperate regions of North America, Eurasia and Australasia; Sonoran distribution: desert to mountain areas of Arizona, southern California, Sonora, Sinaloa, Chihuahua Baja California and Baja California Sur.
less ↑
Lichens of Olompali State Historic Park
