Xanthoparmelia diadeta (Hale) Hale
Phytologia 28: 487 (1974).
Basionym: Parmelia diadeta Hale, Bot. Notiser 124(3): 346 (1971).
Synonyms: Index Fungorum
Type: xxx.
Thallus: very tightly adnate to tightly adnate, 2-5 cm broad, dull yellowish green, darkening at the centre; lobes subirregular to sublinear, 0.7-1.3 mm wide, contiguous to imbricate; upper surface continuous, maculate, shiny, densely isidiate, the isidia cylindrical (Figure 14e), 0.06-0.10 mm in diameter, 0.2-0.3 mm high, the tips syncorticate, darkening, unbranched; medulla white; lower surface plane, black, moderately rhizinate, the rhizines black, simple, 0.1-0.3 mm long. Pycnidia lacking. Apothecia rarely developed, substipitate, 1-2 mm in diameter; spores 5x 8-9 µm.
Photobiont: Trebouxia.
Chemistry: Salazinic acid, consalazinic acid (+/-), usnic acid.
Ecology: On rock.
Molecular data: Genbank
Distribution: Database
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