Xanthoparmelia plittii (Gyeln.) Hale
Phytologia 28: 488 (1974).
Basionym: Parmelia plittii Gyeln., Reprium Nov. Spec. Regni Veg. 29: 287 (1931).
Synonyms: Index Fungorum
Type: USA, Maryland, Baltimore County, Liberty Road at Gwynna Falls, Plitt (BP - lectotype; US - isolectotype).
Thallus: adnate to loosely adnate, 4-10 cm broad, yellowish green; lobes subirregular, 1-2 cm wide, contiguous to imbricate; upper surface continuous, emaculate, shiny, moderately to densely isidiate, the isidia cylindrical, 0,08-0,15 mm in diameter, 0,1-0,5 mm high, the tips syncorticate, darkening, simple or becoming densely branched with age; medulla white; lower surface plane, pale brown or darkening, but not blackening, moderately rhizinate, the rhizines pale brown, simple to furcate, 0,3-0,6 mm long. Pycnidia uncommon; conidia bifusiform, 0,5 x 5-7 µm. Apothecia common, substipitate, 2-7 mm in diameter; spores 4 - 5 / 9 - 10 µm.
Photobiont: Trebouxia.
Chemistry: Stictic acid, constictic acid, norstictic acid, usnic acid (xxx). Usnic acid, stictic acid, norstictic acid (Will-Wolf 1998: 332)
Ecology: On rock, rarely tree bark.
Molecular data: Genbank
Distribution: Venezuela, Colombia, Brazil, Paraguay, Uruguay. Database
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