Thelotrema conforme

Thelotrema conforme

Thelotrema conforme Fée, 1837:89.

Thelotrema consanguineum Müller-Argau, 1887b:398 [type-collection: Apiahy, Brazil, Puiggari 477 (G, lectotype); Figure 14k].

TYPE-COLLECTION.—On Cinchona, America meridionalis, without collector (G, lectotype) (Figure 14j).

Thallus whitish mineral gray, smooth and shiny, epiphloeodal, forming colonies up to 10 cm broad; apothecia emergent, 0.8–1.0 mm in diameter, apically carbonized, distinct columella present; pore round, 0.1–0.15 mm in diameter, surrounded by a whitish, sometimes raised ring; hymenium 170μ–200μ high; spores 4/ascus, muriform, 8–10 loculate transversely, 2–4 loculate longitudinally, 18μ–20μ × 35μ–50μ, 1+ blue (Figure 14l).

CHEMISTRY.—Psoromic and conpsoromic acids.

HABITAT.—Lower bole and trunk in open rain forest (670 m).

The Dominican material is a satisfactory match for Fée’s type-specimen, which has slightly smaller apothecia and a less consistently developed annulate pore. The spores are definitely in the intermediate size range in contrast to related T. leucinum which has small spores.

SPECIMENS EXAMINED.—24a (37739, 38062).