IUCN threat status:

Not evaluated

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Description

 Thallus: crustose, epiphloedal, effuse, continuous to rimose, thin (c. 100 µm thick), sometimes poorly delimited and reduced to dispersed granules; surface: ashy to white or sometimes yellowish gray, minutely granulose or finely scaly; medulla: not differentiated; Ascomata: round or somewhat irregular, subsessile to sessile, constricted at base, 0.3-0.6 mm in diam., isolated or rarely aggregated; disc: black, flat to slightly convex, epruinose to densely white pruinose; margin: black, thin, becoming crenulate, granulose or verrucose; exciple: dark brown internally, with hyphae visible in outer part, branched and interwoven, with reddish walls, occasionally incrusted with granules or crystals insoluble in K; hymenium: hyaline, 70-75 µm tall, I+ yellow or red; paraphysoids: lax, loosely branched and interwoven, hardly anastomosed, 1.5 µm wide little or not enlarged apically, coralloid; subhymenium: hyaline or pale yellow, 20-30 µm thick; hypothecium: dark-brown to black; asci: cylindrico-clavate, 50-60 x 13-14 µm, 8-spored; ascospores: hyaline, transversely 3(-4)-septate, straight or somewhat curved, fusiform with one end slightly attenuated, with two end cells longer than the two central ones, 21-29(-36) x (3.5-)4-5(-6.5) µm; wall: thin and uniform; Pycnidia: not seen; Spot tests: thallus K- or orange, C-, KC-, P-; Secondary metabolites: none detected.; Substrate and ecology: on smooth rarely rough bark of various trees shrubs in coastal areas; World distribution: western North America (California); Sonoran distribution: southern California and Baja California. 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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