Xanthoparmelia dichotoma (Müll. Arg.) Hale
Phytologia 28: 487 (1974).
Basionym: Parmelia dichotoma Müll. Arg., Flora, Regensburg 69: 257 (1886).
Synonyms: Index Fungorum
Type: xxx.
Thallus: loosely adnate to subascending, pulvinate, firm, 4-10 cm broad, dull yellowish green; lobes sublinear, 1.5-3 mm wide, elongate, irregularly dichotomously branched, loosely imbricate and subascending, black rimmed; upper surface continuous, emaculate, shiny, isidia and soredia lacking; medulla white; lower surface plane to weakly convoluted, dark brown to mostly black, rhizines sparse, brown to black, 0.5-1 mm long. Pycnidia rarely developed; conidia not found. Apothecia rare, substipitate, 2-5 mm in diameter; spores 6x 8-9µm.
Photobiont: Trebouxia.
Chemistry: Norlobaridone, loxodin, usnic acid.
Ecology: On rock.
Molecular data: Genbank
Distribution: Database
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