Hymenophore annual, tufted-membranous, loosely attached, effused forming linear or irregular areas 1-3 cm across; hymenial surface ranging from cinnamon to fuscus, or dingy olivaceous, strongly granular; margin thinning out, fibrillose, concolorous, loosely attached. Context fuscus, 120-200 µ thick, intermediate layer of loosely arranged mainly upright hyphae, hyaline or tinted brown, basal layer scanty, composed of a few repent hyphae with sparse septa and walls coloured chestnut-brown; generative hyphae 3-4 µ diameter in hyphae of the intermediate layer, walls 0.2 µ thick, basal hyphae 5-6 µ diameter, walls to l µ thick, septate, freely branched, with large clamp connexions. Hymenial layer to 60 µ deep, a close palisade of hyaline basidia and paraphyses. Basidia subclavate, 30-50 x 6-8 µ, 2-4-spored; sterigmata slightly arcuate, to 6 µ long. Paraphyses subclavate, or as often subfusiform, shorter and narrower than the basidia. Spores subglobose, or oval, sinuate, 6-9 x 6-8 µ, walls tinted brown, irregularly aculeate, 0.5 µ thick, spines to 0.5 µ long.

DISTRIBUTION: New Zealand.

HABITAT: Effused on decorticated decayed wood.

Hymenophorum annum [sic], membranaceum, effusum; superficies hymenii cinnamomea, fusca vel olivacea, granulosa. Medium stratum libere ramosarum, hyalinarum hypharum 3-4 µ diam., infimum aliquot repentium hypharum 4-6 µ diam., castanets parietibus 1 µ crassis, septatis, nodulosis. Basidia subclavata, 30-50 x 6-8 µ, 2-4 sporis in gracilibus sterigmatis 6 µ longis. Sporae subglobosae vel ovales, sinuosae, 6-9 x 6-8 µ, parietibus ferrugineis, inaequaliter et breviter verruculosis.

The species belongs to the section "Dimorphae" of Bourdot & Galzin (1928, 503), containing plants with repent, thick-walled, sparsely septate, coloured basal hyphae and hyaline (or tinted only) thin-walled mainly upright hyphae of the intermediate layer. It resembles T. epiphylla in the granulose surface, but differs in that cordons are absent, spores are smaller and context hyphae are much lighter in colour. Basidia, though long, are narrower than those of other species placed in the section "Dimorphae".

Nothofagus fusca (Hook.f.) Oerst. Westland: Staircase Creek, Reefton, 2,000ft, November, 1952, S.D.Baker, type collection, P.D.D. herbarium, No. 15892.