Hypotrachyna silvatica (Lynge) Hale

Hypotrachyna silvatica

Parmelia silvatica Lynge, 1914:118. [Type collection: Santa Anna da Chapada, Mato Grosso, Brazil, Malme 2393* (S, lectotype).]

Parmelia Crustacea Lynge, 1914:108. [Type collection: Santa Anna da Chapada, Mato Grosso, Brazil, Malme (S, lectotype).]

Parmelia silvatica var. pinnata Lynge, 1914:120. [Type collection: Santa Anna da Chapada, Mato Grosso, Brazil, Malme 2393*** (S, lectotype).]

Parmelia silvatica var. radiata Lynge, 1914:120. [Type collection: Santa Anna da Chapada, Mato Grosso, Brazil, Malme 2393** (S, lectotype).]

Thallus closely adnate on bark, whitish mineral gray, 2–6 cm in diameter; lobes sublinear, often crowded, 0.5–2 mm wide; upper surface plane, shiny, faintly maculate; medulla in the lower half antimony yellow; lower surface moderately rhizinate, the rhizines densely dichotomously branched. Apothecia common, adnate, 1–2 mm in diameter; spores 5μ–6μ × 10μ–12μ.

CHEMISTRY.—Cortex K−, medulla K−, C−, P+ orange-red (lichexanthone, protocetraric acid, and an unidentified anthraquinone).

DISTRIBUTION.—Southern Brazil.

HABITAT.—On trees in open forests.