Flora of New Zealand Series

Holotype: New Zealand. Westland, Greymouth. Comm. F. von. Müller 21, G.

M. marginiflexoides. Type: New Zealand. Wellington. Near Palmerston North, 29 October. H.H. Allan, ?TNS.

Thallus pale grey to white, rather thick (c. 50-200 µm), wrinkled and irregularly cracked to nearly smooth, occasionally more strongly uneven, densely verrucose, verrucae 0.2-0.3 mm diam., and 0.2-0.3 mm tall, often overgrowing bryophytes on bark, very irregular in shape, soredia and isidia absent. Apothecia scattered, 0.8-3.5 mm diam., disc plane or subconvex, black or rarely brown, pale grey-pruinose, dull, margins prominent, thick, black, epruinose or rarely pruinose in a narrow rim around disc, slightly glossy. Epithecium olive-green to olive-brown or pale yellow-brown to dark brown or almost black, diffuse, granular in upper part, 7-14(-24) µm thick. Hymenium 120-160 µm tall, I+ blue. Ascospores 1 per ascus, 1-septate, straight, 80-165 × 25-43 µm, wall 2 µm thick, epispore 1 µm thick, warted. Chemistry: Pannarin (Pd+ orange) and zeorin.

N: S: St: A: C: Ch: Throughout, widespread in forested areas in medium to high light, s.l. to 1000 m.

Endemic

M. gompholoma subsp. gompholoma is the most widely collected species of the genus in New Zealand and in earlier accounts is recorded as M. marginiflexa sensu Church. Bab., non sensu J.D. Hook. et Taylor. It is known on a wide variety of substrates: Dacrydium cupressinum, Griselinia littoralis, Hoheria populnea, Melicytus ramiflorus, Metrosideros spp., Nothofagus menziesii and Myrsine australis.