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Description

 Thallus: crustose, at least partially endolithic, verruculate; verrucules: scant, tiny or lacking,; perithecial warts subspherical with the base constricted, to 0.7 mm broad; surface: (if visible) black, sometimes a paling of the substrate is only visible; prothallus: absent; Perithecia: single in the verrucule, up to 0.5 mm broad; involucrellum: black carbonaceous and constricted below, algae visible in lower portion, subcompound in the sense of Swinscow, dark reddish brown; hymenium: interior I+ blue; asci: saccate, 2-spored; ascospores: ellipsoid, dark brown, muriform, up to 8-septate transversely and 3-septate longitudinally, 33-62 x 18-33 µm; Spot tests: all negative; Secondary metabolites: none detected.; Substrate and ecology: on calcareous rocks, shales or sandstones; altitudes for western specimens range from 900 to 2800 m; World distribution: western North America; Sonoran distribution: scattered throughout Arizona and southwards into Sonora. 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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