NEW ZEALAND: North Island: North Auckland, Hunua Range, Franklin Co., Mangatangi Valley, under Nothofagus-Leptospermum, 19.VI.1974, leg. HAYDON, PDD 32253,(ZT 76/239). - Gisborne: Urewera N. P., Ngamoko Track, under Nothofagus-Leptospermum, 22.V.1981, leg. HORAK (ZT 641).South Island: Nelson, Tophouse Saddle, under N. solandri var. cliffortioides-menziesii-fusca, sometimes in association with Sphagnum, 1.V.1968, leg. HORAK (ZT 68/338). - Westland, Ngahere, Lake Haupiri, Kopara, under N. fusca, 13.XII.1967, leg. HORAK, PDD 27178, holotype (ZT 67/249, isotype).

Pileus -50 mm, hemispherical or conico-convex becoming broadly umbonate or campanulate; red-brown or chestnut brown at centre, yellow or orange towards margin; viscid to subglutinous when moist, innately fibrillose in dry condition, often radially wrinkled, hygrophanous, margin distinctly striate, with fibrillose to agglutinated semipersistent veil remnants along margin. - Lamellae 10-20,5(-7), emarginate and subdecurrent with short tooth, ventricose, -5 mm wide; yellow, ochre or orange at first turning rust orange in mature specimens, edges concolorous or paler, fimbriate or subserrate from cheilocystidia. - Stipe -70 x -7 mm, cylindrical or subclavate, often subfusoid at base, single or cespitose; sulphur yellow to yellow-ochre, below fugaceous cortina with several yellow to yellow-brown viscid zones and belts of veil; dry (except veil remnants when fresh), longitudinally fibrillose, hollow, often with yellow rhizomorphs. - C o n t ex t yellow-orange in pileus and stipe. - Odour and taste raphanoid (or like raw potatoes), often faint. - Chemical reactions on pileus: KOH - red; HCl, NH3-negative. Spore print rust brown. - Spores (7-) 7.5-9.5 x (4-) 5-6 µm, ovoid, verrucose, rust-brown. Basidia 25-40 x 7-10 µm,4-spored. - Cheilocystidia conspicuous, composed of articulated cellchains, terminal cells (10-30 x 12  µm) ovoid or clavate, membranes thin-walled, hyaline. - Pileipellis a cutis or trichoderm composed of cylindrical hyphae (4-8 µm diam.), terminal cells cylindrical or fusoid-conical, membranes gelatinized, with red-brown to purple-grey plasmatic pigment dissolving in KOH, subcuticular layers cellular. - Clamp connections present.

On soil in Nothofagus-forest (N. solandri var. cliffortioides-fusca-menziesii), sometimes in mixed stands with Leptospermum spp. - New Zealand.

Pileus -50 mm, ex hemisphaerico campanulatus, castaneus vel luteoaurantiacus marginem versus, viscidus. Lamellae emarginatae, luteae dein ferrugineoaurantiacae. Stipes -70 x -7 mm, cylindricus vel subclavatus, sulphureus, zonis luteobrunneis subviscidis e velo obtectus. Odor saporque raphanoidei. KOH - ruber. Sporae (7) 7.5-9.5 x (4-)5-6 , ovoideae, verrucosae. Cheilocystidia conspicua. Ad terram in silvis nothofagineis. Novazelandia.

In New Zealand D. castaneodisca is found to be a common species in mixed Nothofagus-Leptospermum forests. There is ecological evidence, however, that this agaric can enter ectomycorrhiza only with Nothofagus spp. (HORAK, unpubl.). Macroscopically D. castaneodisca is recognized by the yellow-orange pileus with maroon red disk. In moist conditions both the pileal surface and the yellow-orange veil remnants scattered over the stipe are viscid or glutinous. Based upon these characters D. castaneodisca must be considered a typical representative of Dermocybe subgen. Icterinula (MOSER & HORAK, 1975). Seven different pigments have been extracted from carpophores of D. castaneodisca. Apart from endocrocin, however, the molecular properties of the remaining six components are not yet elucidated (KELLER & al., 1988).

Holotypus PDD 27178.