Hypotrachyna ducalis (Jatta) Hale

Hypotrachyna ducalis

Parmelia ducalis Jatta, 1908:407. [Type collection: Mobuku Valley, Nabitava verso Kirchuchu, and Duroni W of Valle dei Laghi, Ruwenzori, Apruti (not seen).]

Thallus loosely adnate, whitish mineral gray, about 10 cm broad; lobes linear-elongate, separate to divaricate, 2–5 mm wide; upper surface plane, shiny, soredia and isidia lacking; lower surface densely rhizinate, the rhizines densely dichotomously branched. Apothecia seen only in African material: 3μ–4μ × 8μ–9μ.

CHEMISTRY.—Cortex K+ yellow, medulla K− C+ red, P− (atranorin and anziaic acid).

DISTRIBUTION.—Venezuela, Peru, and Africa.

HABITAT.—Over mosses and humus at the base of trees in thickets in open areas and paramo at 3000–3800 m elevation.