Hypotrachyna palmarum (Lynge) Hale

Hypotrachyna palmarum

Parmelia palmarum Lynge, 1914:136. [Type collection: Buriti, Serra da Chapada, Mato Grosso, Brazil, Malme 2243C* (S, lectotype).]

Parmelia zahlbruckneri Lynge, 1914:125. [Type collection: Bocca da Serra, Serra da Chapada, Mato Grosso, Brazil, Malme S, lectotype).]

Thallus adnate, turning cream or cinnamon-buff in the herbarium, rather fragile, 3–8 cm broad; lobes sublinear, crowded, more or less imbricate, short, 1–3 mm wide; upper surface shiny, plane to rugose and cracked on older lobes, isidia and soredia lacking; medulla white to very pale yellow; lower surface moderately rhizinate, the rhizines rather sparsely dichotomously branched. Apothecia common, adnate, the amphithecium crenate, the disc often split, 2–6 mm in diameter; spores 5μ–7μ × 9μ–11μ.

CHEMISTRY.—Cortex K+ yellow, medulla K−, C−, KC+ rose, P− (atranorin, colensoinic acid, the “palmarum” unknown, and other unidentified substances).

DISTRIBUTION.—Southeastern Brazil.

HABITAT.—On trees or sandstone outcrops in open or secondary forests at 600–1500 m elevation.