Holotype (PC); 'Akaroa, N.Z.; leg. G. Stevenson, 1.VIII. 1948 (409)'.

‘Cap fragile, splitting, silky, purple stained, with bright yellow dusting; gills or ? tramal plates closely pressed together, somewhat convoluted in places, covered with rust coloured spores; stalk fragile, solid, fleshy purple stained yellow, silky, striate, distinct small volva at base. 1 specimen rotten' (description after G. Stevenson, in sched.)
Spores 12-14 x 7-8 µm, sublimoniform, axially symmetric, covered with broad warts, perisporium well developed, germ pore absent, ferruginous. Basidia or cystidia not observed. Structure of the cuticle unknown because of the fragmentary condition of the type material.

On soil. New Zealand.

Heim (1951: 142)

This species is remarkable because of its membranaceous volva at the base of the stipe and the sublimoniform spores. The description of Th. conei (Heim) is based on the observations of a single, half-rotten carpophore and inevitably fresh material must be found again in order to define all taxonomic characters not known at present. We agree with Singer & Smith (1958: 204) that a critical study of fresh gastrocarps may reveal that Th. conei (Heim) should to be assigned to another genus which was named Volvigerum (Horak & Moser) Heim (1966: 152)