Hypotrachyna flavida (Zahlbr.) Hale

Hypotrachyna flavida

Parmelia flavida Zahlbruckner, 1929:137. [Type collection: Based on P. flava Krempelhuber not P. flava Rebentisch, 1804:303.]

Parmelia flava Krempelhuber, 1873:10. [Type collection: Serra de Piedade, Brazil, Warming 294 (M, lectotype; G, UPS, isolectotypes).]

Parmelia flava var. stellata Lynge, 1914:150. [Type collection: São João d’el Rey, Minas Gerais, Malme 311 (S, lectotype).]

Parmelia flava var. subdichotoma Lynge, 1914:149. [Type collection: São João d’el Rey, Minas Gerais, Brazil, Malme 310 (S, lectotype).]

Thallus adnate to loosely attached, coriaceous, sea-foam green, 3–5 cm broad; lobes sublinear, separate, 0.5–2 mm wide; upper surface plane to convex, continuous or irregularly cracked on older lobes; lower surface moderately rhizinate, the rhizines long, sparsely dichotomously branched, often projecting beyond the lobe margins. Apothecia adnate, 1–3.5 mm in diameter; spores 5μ–6μ × 10μ–12μ.

CHEMISTRY.—Cortex K−, medulla K−, C−, or KC+ rose, P+ orange-red (usnic acid and protocetraric acid).

DISTRIBUTION.—Colombia, Venezuela, Peru, and Brazil.

HABITAT.—On open sandstone outcrops or (rarely) on soil at 1200–4100 m elevation.