Collema quadriloculare F.Wilson
Thallus small to large to 10 cm diam., usually less, ± foliose, adnate or partly ascending, thin to thick, membranous, sparsely rugose or smooth or knotty, pale or dark olive-green to blackish, lower surface paler, matt or partly glossy, without isidia or sometimes with isidia-like outgrowths. Apothecia ± numerous, scattered to dense, sometimes crowded, laminal or marginal, appressed, sessile, constricted at base, very small, 0.5-0.8(-1) mm diam., disc plane, subconcave to subconvex, dark red to blackish, matt, epruinose, thalline margin thin to thick, entire, ± smooth, not prominent, persistent to ± disappearing. Ascospores 8 per ascus, ± polystichous, imbricate, linear-oblong with rounded ends, straight to slightly curved, 4-celled, 20-30(-35) × (3-)4.5-5(-7) µm. Pycnidia sparse, laminal and marginal, immersed, globose, 170 µm diam.
One variety is rarely present in New Zealand.
