Panellus atrofulvus Stevenson (29 D) Fig. 2 = Heimiomyces atrofulvus (Stevenson) comb. nov. (Basionym: P. atrofulvus Stevenson, Kew Bull. 19: 29, 1964)

Spores cylindric to slightly phaseoliform, hyaline, amyloid, thin-walled, without germ-pore, 7.5-10.5 X 3.5-4.5 µ. Cheilocystidia none. Caulocystidia irregularly branched, diverticulate, thick-walled, membrane coloured with brown pigment, weak reaction in Melzer's solution, clamp connections present.

Pileus-20 mm, convex when young soon becoming plane or depressed, centre flat to subumbonate; dark red-brown with conspicuous yellow felty or velvety tomentum; dry, velvety to hairy, sometimes with low radially arranged veins at disc, membranous, tough, margin not striate. Lamellae (L 10-18, -3) crowded, broadly adnate to emarginate (decurrent with short tooth), ventricose; pale yellow turning yellow-brown, edge albofimbriate. Stipe-35 x -3 mm, cylindric or gradually enlarged into pileus, central; yellow-brown, with obvious orange tomentum over entire length; dry, entirely velvety to hairy, pruinose in upper portion, hollow, tough, single and cespitose, in groups. Context dark brown, gelatinous. Odour and taste acidulous or not distinctive. Spore print white.

Spores 7-10 x 4 -5 µm, elliptic, sometimes subcylindric to suballantoid, smooth, hyaline, amyloid, germ pore none. Basidia 25-40 x 5-7 µm, 4-spored. Cheilocystidia-60 x-6 µm, conspicuously branched, with irregular, numerous rod-like projections, membranes thick-walled, hyaline or yellow-brown. Pleurocystidia none. Caulocystidia like cheilocystidia but larger, membrane brown (KOH). Cuticle a palisade of erect, fasciculate, cylindric or subfusoid terminal cells (pilocystidia), membranes thick-walled, apex rounded, rarely with antler-like projections, intermixed with clavate to subovate thick-walled, strongly refractive cells. Structure of subcutis like H. neovelutinus (HONGO). Clamp connections numerous.