Caloplaca perileuca Zahlbr.
Lectotype: New Zealand. Wellington, Manawatu Gorge, on partly immersed rocks. H.H. Allan ZA 417, CHR 373804!
Thallus crustose 0.1 mm thick, in small irregular patches 0.5-2 cm diam., coalescing into larger colonies, dingy grey-white or olivaceous, areolate-cracked, areolae minute 0.1-0.3 mm wide, plane, separated by narrow cracks, K-, saxicolous. Apothecia scattered, solitary or 2-4 confluent, sessile, rounded to ± deformed by mutual pressure, 0.2-0.8 mm diam., disc clear orange-yellow, matt, epruinose, plane to subconvex, margins thin, entire, persistent, whitish or pale yellowish. Ascospores biseriate, ovoid-ellipsoid, apices rounded, straight, 2-locular, 12-15.3 × 6.8 µm, septum ¼ to ⅓ length of spore. Paraphyses clavate to moniliform at apices.
N: Known only from the type collection.
Endemic
