Xanthoparmelia diffractaica Hale
Mycotaxon 29: 254 (1987).
Synonyms: Index Fungorum
Type: South Africa.
Thallus: adnate to loosely adnate, leathery, 6-8 cm broad, dark yellowish green; lobes subirregular, 2-3.5 mm wide, apically rotund, continuous to subimbricate, black rimmed; upper surface continuous, emaculate, shiny, irregularly cracked with age, isidia and soredia lacking; medulla white; lower surface plane, pale brown to brown, moderately to densely rhizinate, the rhizines pale brown, simple, 0.5-1 mm long. Pycnidia common; conidia bifusiform, 0.5 X 5-6 µm. Apothecia abundantly developed, adnate to substipitate, 2-7 mm in diameter; spores 5-6 x 9-11 µm.
Photobiont: Trebouxia.
Chemistry: Salazinic acid (major), diffractaic acid (minor), barbatic acid (trace), 4-O-demethylbarbatic acid (trace), usnic acid.
Ecology: on rock.
Molecular data: Genbank
Distribution: Database
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