Hymenophore annual, solitary, firm and woody, laterally attached by a brief stem-like base. Pilei reniform, 2-5.5 cm wide, 2-4 cm radius, 2-4 mm thick; pileus surface ochraceous, darkening to reddish-brown peripherally, polished and glabrous; without a cortex; margin acute, entire, even; hymenial surface dark reddish-brown, even, with a lighter sterile border 1-2 mm wide. Pores ferruginous in section, 3-4 per mm, 200-350 µm diameter, 1-2 mm deep; dissepiments 100-350 µm thick, equal or with apices thickened, even. Context straw or clay colour, to 2 mm thick, of densely intertwined hyphae; binding hyphae 5-8 µm diameter, bovista type, freely branched, branches tapering, aseptate, lumena almost capillary; generative hyphae 3-4 µm diameter, walls 0.2 µm thick, branched, septate, with clamp connections. Hymenial layer to 18 µm deep, a dense palisade of basidia and paraphyses, soon collapsing. Basidia clavate, 12-20 x 6-8 µm, bearing 4 spores; sterigmata erect, to 3 µm long. Paraphyses subclavate, 10-16 x 5-6 µm. Spores narrowly elliptical, obliquely apiculate, 7-10 x 2.5-3 µm, walls smooth, hyaline, 0.1 µm thick.

New Zealand.

Bark of dead standing trunks, type of rot not seen.

Specific features are the glabrous and polished ochraceous surface, reddish-brown hymenial layer, bovista-type binding hyphae, large pores thickened at apices, thick dissepiments, and moderately large elliptical spores. The species is close to Tyromyces fusco-lineatus, the latter differing in the larger spores, differently shaped pileus, and the different hymenial surface.

LOCALITY: Grey River, Westland.