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 Life habit: lichenicolous, on thallus of Physcia species; Thallus: not apparent, with hyaline vegetative hyphae; photobiont: absent; Ascomata: single or fusing to small groups, developing superficially, without host remnants on the surface, sessile, 0.1-0.24 mm in diam.,; disc: black, convex, with smooth to rough surface; epihymenium: olivaceous brown, 10-15 µm thick, with disintegrating uppermost hyphae; hymenium: hyaline, 40-50 µm tall, interascal hyphae 2 µm wide; subhymenium: medium brown, 50-70 µm thick, with cloddy pigments in intercellular spaces; asci: clavate, 30-40 x 14-17 µm, 8-spored, lateral walls not thickened; ascospores: hyaline, 1-septate, obovate, lower cell attenuated, smooth, 14-16 x 5-7 µm, without an epispore; Pycnidia: not seen; Chemical reactions: ascomatal gels I+ red, KI+ blue; asci with KI+ blue ring-structure.; Substrate and ecology: see host; World distribution: subcosmopolitan; Sonoran distribution: Arizona (San Francisco Peaks) and eastern Sonora (Sierra Madre Occidental).; Note: Arthonia epiphyscia is distinguished from Arthonia phaeophyscia by its superficially developing ascomata. 


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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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