Collema leucocarpum Hook.f. & Taylor
Thallus medium to large, to 10 cm diam., foliose, membranous, thin, ± rounded and adnate, ± deeply and broadly lobate, smooth, sometimes slightly and irregularly ridged or folded, pale olive-green to dark olive, lower surface concolorous or greyish-blue, matt or slightly glossy, without isidia. Lobes few, rounded or somewhat extended, imbricate, to 1.5 cm broad, sparsely lobulate, lobules ± rounded, margins entire and somewhat bent downwards or upwards. Apothecia numerous, scattered to dense, laminal or submarginal, sessile with constricted base or rather broadly adnate, 1.5 (rarely to 3.5) mm diam., disc plane to convex, strongly white-pruinose, seldom yellow-pruinose, thalline margin thin to moderately thick, entire, smooth or finely wrinkled, not prominent. Ascospores 6-8 per ascus, distichous to polystichous, straight or twisted in asci, broadly to narrowly fusiform, rarely ± broadly acicular, straight or curved with acute or obtuse ends, 6-8-celled sometimes distinctly constricted at septa, 30-65(-73) × 4.5-6.5(-8.5) µm. Pycnidia common, often abundant and dense, laminal and submarginal, immersed, ± globose, thicker than thallus, 170-260 µm diam., visible as dots or swellings on both sides of thallus, pale or concolorous with thallus.
N: North Auckland (Mahurangi) to Wellington (Tararua Ra.). S: Nelson (Cobb River) to Southland and (Longwood Ra.). St: A: From both coastal and inland areas, mainly corticolous, found on trunks and branches of many trees and shrubs, rarely on rocks or lignicolous, s.l. to 1200 m. In habitats similar to those for C. laeve.
Australasian (also known from South Africa)
