Psoroma rubromarginatum
Description : Flora (1985: 480).
Chemistry : Pd+ orange; containing pannaric acid and porphyrilic acid methyl ester.
S: Canterbury (Craigieburn Ra.), Otago (Conical Hill Humboldt Mts, the Remarkables, Old Man Ra., Rock & Pillar Ra.), Southland (Secretary I. Doubtful Sound, Dusky Sound, Wilmot Pass, Lake Wapiti). St: (Mt Anglem, Mt Allen). A: Adams Is, Mt Dick. C: (Mt Honey). On soil among mosses in wet, exposed alpine or subalpine grassland and in wet, exposed fellfield. Known also from Argentinian Patagonia and southern Chile (Henssen et al. 1983: 40).
Austral
Illustrations : Henssen et al. (1983: 41, fig. 7; 42, fig. 8; 44, fig. 9; 46, fig. 10).
Psoroma rubromarginatum is characterised by: the terricolous habit; the rosette-forming to irregularly spreading lobate thallus; rather variable thalline lobes, 2–5 mm wide and 8–10 mm long, with plicate-radiating or minutely lobulate margins that are thickened below; a convex to plane, minutely wrinkled-verrucose, olive-brownish to olive-greenish or blackened upper surface, suffused ochre-red at margins; flattened, oblong-irregular cephalodia that develop at margins and between lobes, 1–2 mm diam.; scattered to crowded apothecia, round to irregular, 0.5–4.5 mm diam., the disc subconcave to plane or undulate, dark red-brown to brown-black, minutely roughened, with thick, persistent, entire to crenulate-striate margins; and oval, ellipsoidal, subapiculate ascospores, 20–31 × 12–17 μm with a warted-uneven perispore, 2–5 μm thick.
