Flora of New Zealand Series

A. spadiceum (Knight) Müll. Arg., Bull. Soc. r. Bot. Belg. 31: 37 (1892).

Arthonia spadicea Knight, T.N.Z.I. 15: 353 (1883) non Leighton [Ann. Mag. nat. Hist. ser. 2, 13: 442 (1854)].

Lectotype: New Zealand. Sine loco?Wellington. Charles Knight, BM!

Thallus greyish or glaucous grey to grey-white in patches on smooth bark 3-4 cm diam., delimited by a thin black line, thin, rather roughened, cobwebby or ± cracked in parts. Ascocarps innate pale red-brown to yellowish-brown, 0.5-1.0 mm diam., rounded or oblong or occasionally ± irregular, disc roughened or ± granular, flat, K+ purple. Ascospores ovate to oblong, brown, 10-locular, 40 × 18 µm.

N: Known only from the type collection.

Endemic