New Zealand: "Nelson, Murchison, Matakitaki; 28.1.1969, leg. Horak (PDD, 27120: holotype- ZT, 69/35: isotype)".

Pileus 15-30 mm diam., hemispherical, becoming convex or campanulate, margin incurved; brown to fuscous, uniformly coloured; dry, covered with con-colorous, erect, conical, persistent scales and squamules, veil remnants absent, margin estriate. Lamellae adnate to sinuate, ventricose, crowded (L-20, 1-7); dark brown from the beginning, edge conspicuously albofimbriate. Stipe 30-60 x 2-3 mm, cylindrical, equal; concolorous with pileus, with a pink tomentum of mycelium at base, covered with scattered concolorous, persistent dots and squamules, no trace of cortina; dry, solid, single and cespitose. Context [Line of missing text] after bruising or exposure. Odour and taste unpleasant, but not spermatic. Chemical reactions on pileus: KOH-negative.
Spores 9-11.5 x 5-6.5 µm, reniform to phaseoliform, brown, smooth. Basidia 30-40 x 6-8 µm, 4- spored. Cheilocystidia 20-40 x 6-1 µm, clavate to subfusoid, hyaline, thin-walled, scattered on edge Pleurocystidia absent. Cuticle a trichoderm of cylindrical, not gelatinised hyphae (4-8 µm diam.), encrusted with yellow-brown (KOH) pigment. Clamp connections present.

On soil among moss and litter of Nothofagus (N. fusca, N. menziesii). New Zealand.

Pileo -30 mm lato, ex hemisphaerico convexo vel campanulato, brunneo, squamis erectis conicis instructo, sicco. Lamellis adnatis, brunneis. Stipite -60 x -3 mm, cylindrico, pileo concolori, squamis brunneis irregulariter obtecto, mycelio roseo ad basim. Odore nauseoso. Came rubescente. Sporis 9-11.5 x 5-6.5 µm, ovato-reniformibus. Cheilocystidiis clavatis, baud incrustatis. Habitatio ad terram in silvis nothofagineis. Nova Zeiandia. Typus (PDD, 27120).

This species is well characterised by the reddening context in the pileus and stipe. This is reminiscent of I. bongardi (Weinm.) Quel. and I. cervicolor (Pers. ex Pers.) Quel., two taxa which occur in coniferous and deciduous forests of Eurasia, but spores and cheilocystidia of this New Zealand fungus are considerably smaller.