Flora of New Zealand Series

Holotype (fide Degelius 1974, p. 81): New Zealand, Westland. Punakaiki Blowholes, on limestone rocks at roadside. G. Einar and Greta Du Rietz 1618: 4, S.

Thallus small to medium, to 4 cm diam., foliose, ± rounded, adnate or subascendent, ± thin, deeply and rather broadly lobate, pale or dark olive-green, lower surface paler, usually greyish to white, ± matt, epruinose, isidiate. Isidia laminal and marginal, numerous, generally covering the thallus, ± globular or squamiform, rather coarse, to 0.5 mm diam., concolorous with thallus or darker. Lobes extended and radiating, repeatedly furcate, lobules rather few, rounded to extended, usually 1.5-3.5 mm broad, free, contiguous or imbricate, ± concave owing to ascending margin which is coarsely undulate, ± entire, often isidiate with age, not swollen. Central parts of thallus often forming a richly isidiate, diffract-areolate crust. Apothecia numerous, often dense and crowded, in some specimens sparse or lacking, laminal and marginal, flattened, subglobose at first, soon sessile with constricted base 0.5-0.7 mm diam., disc plane to subconcave, dark red, matt, epruinose, thalline margin thin to moderately thick, ± entire, smooth or isidiate, not prominent, often ± disappearing, proper margin thin, pale. Ascospores 8 per ascus (sometimes 4-6), monostichous or distichous, usually imbricate, ellipsoid with obtuse or rounded ends or acute ends, submuriform, to eumuriform with 3-6 transverse septa and 1-2 longitudinal ones, 20-30 × 9-10.5(-14) µm. Pycnidia laminal or marginal, immersed to slightly prominent, globose, to 260µm diam.

S: Nelson (Cobb Valley and Takaka Hills) to Southland (Clifden). Both east and west of the Main Divide, coastal and inland, saxicolous, terricolous or muscicolous, often on limestone s.l. to 1300 m.

Endemic