Xanthoparmelia geesterani (Hale) Hale & Elix
Mycotaxon 33: 403 (1988).
Basionym: Parmelia geesterani Hale, Bryologist 75(3): 344 (1972).
Synonyms: Index Fungorum
Type: xxx.
Thallus: foliose, tightly adnate, somewhat areolate at the center, 2-4 cm broad, dull yellowish green; lobes subirregular, 0.7-1.1 mm wide, short, continuous to imbricate; upper surface continuous, emaculate, shiny, densely isidiate, the isidia globose (figure 15c), 0.1-0.2 mm in diameter, 0.1-0.2 mm high, the tips weakly epicorticate, pale, mostly unbranched, more or less hollow and erumpent with age, sometimes becoming subsorediate; medulla with; lower surface plane, shiny, brown at the tips but blackening at the center, moderately rhizinate, the rhizines dark brown, slender, 0.3-0.5 mm long, simple or with splayed, furcate tips. Pycnidia and apothecia lacking.
Photobiont: Trebouxia.
Chemistry: Salazinic acid, consalazinic acid (trace), usnic acid.
Ecology: on rock.
Molecular data: Genbank
Distribution: Database
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