Weinmannia racemosa L.f. Auckland: Wairongomai Valley, Te Aroha, October 1948, J.M.Dingley; Lake Waikaraemoana, 2,500ft, March 1949, M.Ambler; Waiotapu, 1,600ft, June 1950, J.M.Dingley; Earthquake Flat, Rotorua, 1,800ft, September 1950, G.H.C.; Trig Track, Lake Waikaraemoana, 2,250ft, September 1950, G.H.C.; Mamaku Forest, 1,800ft, September 1956, G.H.C. Taranaki: Mt. Emont, 3.500ft, January 1953, J.M.Dingley, type collection, P.D.D. herbarium, No. 12461. Wellington: Ohakune, 2,500ft, December 1953, J.M.Dingley. Weinmannia sylvicola Sol. ex A.Cunn. Auckland: Chelsea Bush, Birkenhead, July 1950, J.M.Dingley.

Hymenophore pileate, annual, membranous-coriaceous, commonly composed of broad resupinate areas with narrow marginal pilei, sometimes umbonate sessile and orbicular with narrow reflexed edges, or occasionally resupinate, loosely attached, irregularly linear, 4-20 x 3-6 cm. Pileus surface chestnut-brown to umber, with lighter chestnut margin, tomentose, sometimes radiately zonate; hymenial surface date brown with umber periphery and fulvous margin, not creviced, even or more usually following irregularities of the pileus surface, velutinate with the dark setae; margin acuminate, lobed, slightly incurved or erect, bright fulvous. Context chestnut brown with darker abhymenial hairs, 0.25-0.4 mm thick, of mainly radiately arranged hyphae parallel with the hymenium, bordered by a conspicuous intertwined and cemented coloured cortex, and sometimes a fragmental colour zone beneath the subhymenium; hyphal system dimitic; skeletal hyphae chestnut brown, 3-4 µ diameter, walls 0.5-1 µ thick, naked, sparsely branched, sparsely septate; generative hyphae 2-3 µ diameter, walls 0.2 µ thick, hyaline, freely branched and septate. Setae confined to a single row, arising from the base of the subhymenium, projecting to 150 µ, aculeate, sometimes curved at the base, 95-200 x 10-16 µ, walls naked, reddish brown, lumina narrow. Hymenial layer to 40 µ deep, a close hyaline palisade of basidia and paraphyses. Basidia subclavate, 22-26 x 4-5 µ, 2-4-spored; sterigmata slender, upright, to 6 µ long. Paraphyses mostly cylindrical, the same diameter and about two-thirds the length of the basidia. Spores allantoid, 7-9 x 2-2.5 µ, walls smooth, hyaline, 0.1 µ thick.

DISTRIBUTION: New Zealand.

HABITAT: Effused on bark of dead branches associated with a pocket rot.

Pileata, annua, membranaceo-coriacea. Pilei effuso-reflexi, ex partibus latis resupinatis orti; superficies castanea vel umbrina, pilosa, margine castaneo, lobato. Superficies hymenii spadicea, non rimosa; margine fulvo, lobato. Contextus hypharum hymenio parallelarum, castaneus; cortex adest. Hypharum systema dimiticum. Setarum stratum unius ordinis, aculeati, nudi, 95-200 x 10-16 µ, cuius major pars eminet. Basidia subclavata, 22-26 x 4-5 µ, 2-4 sporis, allantoidibus, 7-9 x 2-2.5 µ.

Readily identified among species with a cortex by the unusually long, aculeate, naked setae which arise in a single row and project for the greater part of their length, and the narrow allantoid spores.
Fructifications commence as numerous small orbicular colonies. These soon merge to form (a) linear resupinate areas, (b) umbonate orbicular colonies with erect margins, or (c) umbonate-sessile patelliform plants with free plane margins. At first the pileus surface is bright chestnut, and darkens with age; the hymenial surface is date-brown, changing to chestnut where rubbed, and remains even or may become tardily creviced. Margins are broad and fulvous or chestnut. Sometimes an interrupted colour zone develops beneath the subhymenium, but is as often absent. Other noteworthy features are the limited host range, and pocket rot produced in the host tissues.
The species possesses setae similar to those of H. sallei Berk. & Curt., and some pilei resemble those of H. berkeleyana (Mont.) Cke. From both it differs in possessing a conspicuous cortex.

Taranaki: Mt. Emont, 3.500ft, January 1953, J.M.Dingley, type collection, P.D.D. herbarium, No. 12461