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 Thallus: crustose, continuous to scurfy, often rimose-cracked, stratified with a distinct medulla or not stratified, delimited; prothallus: white, felty; surface: silver-gray to dark gray, or greenish white to creamy white, corticate, arachnoid-byssoid, or powdery, sorediate or esorediate; photobiont: primary one a green alga, secondary photobiont absent; Ascomata: apothecial, round, 1(-3) immersed in thalline verrucae; disc: black to brown, usually white pruinose; margin: irregularly crenate or indistinct; exciple: indistinct to poorly developed; epihymenium: yellow, brown to dark brown-black, up to 90 µm thick, densely inspersed with crystals; hymenium: colorless to pale straw, up to 310 µm tall; hypothecium colorless, of densely interwoven hyphae, up to 110 µm tall, sometimes not evident; paraphyses: mostly simple, but slightly branched and anastomosed in uppermost part, conglutinated or not, filiform; apical cell: only slightly swollen; asci: broadly clavate to cylindrical-ellipsoid, with an indistinctly to distinctly thickened apex and I- tholus but I+ blue outer sheet, 1-8 spored; ascospores: hyaline, or smoky gray or pale yellow when old, muriform, with or without apiculae, up to 305 x 75 µm; Conidiomata: pycnidial; conidiogenous cells simple; conidia: short, bacilliform; Secondary metabolites: depsidones; Geography: Africa, Asia, Europe, North America, South America, Australia (mainly a Southern Hemispheric genus); Substrate: bark, corticolous bryophytes, occasionally over bark and on rocks.; Note: Originally Phlyctis was described as a section of Peltigera (Basionym: Peltigera sect. Phlyctis Wallr., Fl. Crypt. Germ.: 3: 553 [1831]), which is a foliose genus with hardly any characters in common. 


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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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