Arthothelium pellucidum (C.Knight) Müll.Arg.
Arthonia pellucida Knight, T.N.Z.I. 15: 352 (1883).
Lectotype: New Zealand. Sine loco? Wellington. Charles Knight, BM!
Thallus whitish to greyish-white, very thin, rather eroded, smooth, or ± hummocky, cobwebby or occasionally cracked to ± continuous. Ascocarps 0.2-1.1 mm diam., black, depressed-innate, rounded to effigurate, often branched, ± covered by thallus, interior pellucid. Ascospores cuneate-oblong, brownish, 6-locular, 20 × 8 µm.
N: Known only from the type collection.
Endemic
