FAGACEAE: Nothofagus fusca: Murchison, 140 m; Orwell Creek, Ahaura, 120 m, type collection, P.D.D. herbarium, No 17432.

Hymenophore annual, membranous, adherent, effused forming irregular areas to 10 x 4 cm; hymenial surface white, soon cream, verruculose, tuberculate, not creviced; margin thinning out, arachnoid, white, adherent. Context white, to 35 µ thick, basal layer of a few repent hyphae, intermediate layer of scanty erect hyphae embedding numerous stellate crystals; generative hyphae 3-3.5 µ diameter, walls 0.2 µ thick, naked, with clamp connections. Cystidia projecting for the greater part of their length, arising from the base of the hymenial layer, cylindrical or irregularly so, 90-120 x 7-9 µ, walls naked, to 2 µ thick at bases, tapering gradually to apices. Hymenial layer to 20 µ thick, a scattered palisade of basidia, paraphyses, cystidia, and paraphysate hyphae. Basidia subclavate, 10-12 x 4-4.5 µ, bearing 2-4 spores; sterigmata arcuate, slender, to 5 µ long. Paraphyses subclavate, 6-10 x 3.5-4 µ. Paraphysate hyphae arising from the hymenial layer when projecting for the greater part of their length, 30-70 x 4-6 µ, apices inflated to 12 µ. Spores globose or subglobose, a few oval, some apiculate, 5-6 µ diameter, or 6.5 x 5 µ, walls smooth, hyaline, 0.1 µ thick.

TYPE LOCALITY: Ahaura, Nelson, New Zealand.
DISTRIBUTION: New Zealand

HABITAT: Effused on bark of dead trunks and branches.

Hymenophorum membranaceum, adnatum, effusum; superficie alba deinde cremea, verruculosa vel tuberculata, non rimosa. Hyphae generatoriae fibulatae, 3-3.5 µ diam. Cystidia cylindricalia, 90-120 x 7-9 µ, apicibus rotundis, basis radicatis, parietibus nudis, ex basi ad apicem fastigata. Basidia subclavata, 10-12 x 4-4.5 µ, 2-4 sporis. Sporae globosae vel subglobosae, 5-6 µ diam., parietibus levibus, hyalinis. On dead bark of Nothofagus fusca, Ahaura, Nelson, N.Z.

Specific features are the subglobose or globose smooth spores, long cylindrical cystidia with naked walls becoming progressively thinner towards apices, and large capitate paraphysate hyphae some bearing acicular crystals. Cystidia resemble those of T. subalutacea, capitate paraphysate hyphae those of T. rimicola.