Nothofagus cliffortioides (Hook.f.) Oerst. Wellington: Mt. Holdsworth, Tararua Ranges, 3,500ft, September 1952, G.H.C.; Kaimanawa Ranges, 2,800ft, September 1956, G.H.C. Canterbury: Christchurch Botanic Gardens, October 1921, W.K.Dallas. Otago: Routebourne Valley, Lake Wakatipu, 2,500ft, February 1948, J.M.Dingley. Nothofagus fusca (Hook.f.) Oerst. Auckland: Lake Waikaremoana, 2,800ft, November 1955, J.M.Dingley. Nelson: Staircase Creek, Reefton, 2,000ft, November 1952, S.D.Baker; Lake Rotoiti, 2,000ft, April 1956, S.D.Brook, type collection, P.D.D. herbarium, No. 16548. Westland: Orwell Creek, Ahaura, November 1954, J.M.Dingley. Nothofagus menziesii (Hook.f.) Oerst. Hawke's Bay: Poronui, Kaimanawa Ranges, 2,000ft, June 1953, J.M.Dingley. Otago: Otautau, 3,000ft, November 1946, G.B.Rawlings. Nothofagus truncata (Col.) Ckn. Auckland: Lake Waikaremoana, 3,560ft, September 1950, G.H.C.

Hymenophore pileate, annual, membranous, effused reflexed with broad resupinate base and narrow marginal pilei, or resupinate, loosely attached and readily peeling away from the substratum, forming irregularly linear areas 0.5-16 x 0.5-4 cm. Pilei either reflexed or narrow upturned edges of broad resupinate areas, to 3 mm across, surface tan or chestnut-brown, finely hirsute with adpressed radiately arranged hairs; margin crenate, often torn, fawn; hymenial surface at first fulvous, then chestnut or umber, becoming deeply creviced when the cinnamon context becomes exposed, velutinate; margin thinning out slightly, lifting readily and becoming incurved, concolorous, lacerate. Context cinnamon or chestnut-brown, 150-250 µ thick, composed of radiately arranged parallel hyphae bordered by the cortex and a colour zone beneath the subhymenium, sometimes with islands of similar tissue between; hyphal system monomitic; generative hyphae varying from 2.5 µ to 6 µ, walls 0.25 µ thick, golden yellow or hyaline, collapsing readily, freely branched and septate. Setal layer to 150 µ deep, setae crowded into two overlapping rows, arising in the base of the subhymenium, sometimes limited to one row, projecting to 80 µ, subulate or as often narrowly fusiform, a few slightly falcate, 65-145 x 8-10 µ, walls naked, reddish-brown, lumina narrow. Hymenial layer to 50 µ deep, a dense palisade of basidia and paraphyses. Basidia subclavate, 18-25 x 4.5-6 µ, 1-2 spored; sterigmata erect, slender, to 8 µ long. Paraphyses subclavate, the same diameter but shorter than the basidia, walls usually tinted yellow. Spores elliptical, or oval, 7-8 x 4.5-5 µ, walls smooth, hyaline, 0.2 µ thick.

DISTRIBUTION: New Zealand.

HABITAT: On bark of dead fallen branches associated with a white rot.

Pileata, annua, membranacea. Pilei effuso-reflexi, ex partibus latis, resupinatis orti; superficie alutacea vel castanea, pilis appressis radiatim ordinatis tecta; margine crenato, hinnuleo. lacerato. Superficies hymenii fulva deinde castanea vel umbrina, rimosa; margine libero, incurvato, concolori, lacerato. Contextus hypharum hymenio parallelarum, cinnamomeus; cortex adest. Hypharum systema monomiticum. Setarum stratum 2 ordinibus, subulatis vel anguste fusiformibus, nudis, 65-145 x 8-10 µ, partim superimpositis, ad 80 µ eminentibus. Basidia subclavata, 18-25 x 4.5-6 µ, 1-2 sporis ellipticus vel ovalibus, 7-8 x 4.5-5 µ.

Two structures aid in separating the species from others examined. The hyphal system is monomitic, an unusual feature in species with the context composed of radiately arranged parallel hyphae. Basidia bear 1 or 2 broadly elliptical spores, instead of the usual 4.
Pilei are usually upturned margins of broadly resupinate areas, with chestnut-brown surface clothed in adpressed hairs. Fructifications are loosely attached and tend to peel from the substratum and curl upwards or inwards, exposing the abhymenial surface, which is clothed throughout with hairs. The hymemal surface is coloured a rich vandyke-brown, with broad fulvous margins, and so deeply creviced that the cinnamon context is exposed. Setae are arranged usually in two overlapping rows; in young plants, or peripheral areas of actively growing specimens, they are confined to one row. They are soft and flaccid, tending to bend rather than break when crushed. At first the cortex is scantily developed, but in fertile specimens attains a thickness of about 30 µ. A second colour zone is tardily developed, although in mature plants it may form a thick layer of closely intertwined deeply coloured hyphae lying beneath the subhymenium.

Lake Rotoiti, 2,000ft, April 1956, S.D.Brook, type collection, P.D.D. herbarium, No. 16548