Hypotrachyna malmei (Lynge) Hale

Hypotrachyna malmei

Parmelia malmei Lynge, 1914:116. [Type collection: Bocca da Serra, Mato Grosso, Brazil, Malme 2750 (S, lectotype; W, isolectotype).]

Thallus loosely adnate on rocks, very fragile, 3–5 cm in diameter, ashy white; lobes sublinear, short, crowded, 0.5–1.5 mm wide; upper surface plane, dull, pustulate, the pustules entire or bursting open apically, without forming soredia; medulla in part yellow-ochre below; lower surface moderately rhizinate, the rhizines sparsely dichotomously branched. Apothecia adnate, the amphithecium pustulate, 0.5–2 mm in diameter; spores 6μ–8μ × 8μ–12μ.

CHEMISTRY.—Cortex K−, medulla K− or K+ reddish, P+ orange (lichexanthone, protocetraric acid, alectoronic acid, and rhodophyscin).

DISTRIBUTION.—Southeastern Brazil.

HABITAT.—On open sandstone outcrops.