HOLOTYPE : PDD 27001 (Isotype Herb. HK. ZT 68/641): "On soil under Cyathea dealbata. C. smithii, Phyllocladus trichomanoides, and Leptospermum ericoides; Kauaeranga Valley, Coromandel Peninsula, N.Z.; leg. Horak, 5.VII.1968".

Pileus 5-30 mm diam., hemispherical or conical when young, later convex or campanulate; deep brown, tobacco brown or clay coloured; distinctly grooved or wrinkled, radially veined, dry, hygrophanous: with scattered, fibrillose remnants of the veil along the non striate margin. Lamellae (L 10-15, 13) adnate or adnexed, ventricose: beige, later becoming clay or buff brown with white, fimbriate gill edge. Stipe 20-60 x 2-4 mm, cylindrical, fistulose, single: whitish or concolourous with pileus, covered with darker dots and squamules of the veil remnants, permanent cortina or ring absent; dry, apically pruinose. Context not gelatinous, brownish. Smell and taste not distinctive. Chemical reactions on pileus: KOH— negative.
Spore print brown. Spores 12-15 x 11-14 µm, cruciform, rhomboid (like the spores of Pterospora Metrod 1949), smooth, thin-walled, yellow-brown, germ pore absent. Basidia 13-20 x 8 µm. 4-spored. Cheilocystidia (and caulocystidia) 40-50 x 10-14 µm, fusoid, thin-walled, hyaline, without crystals, forming a sterile zone at the gill edge. Cuticle an hymeniderm consisting of clavate cells (25-40 x 8-15 µm), membrane not gelatinised, strongly encrusted with brown pigment, clamp connections present.

On soil under litter of Cyathea, Phyllocladus, and Leptospermum. New Zealand.

Characteribus generis adsunt; pileo 5-30 mm lato, tabacino. Lamellis acie alba instructis. Stipite 20-60 x 2-4 mm, albido vel argillaceo-brunneo, fibrillis obscurioiribus e velo instructo. Caro argillaceo-brunnea, baud gelatinosa. Odore saporeque nullo. Sporis 12-15 x 11-14 µm. Basidiis 13-20 x 8 µm. Cheilocystidiis 40-50 x 10-14 µm, hyalinis. Epicute e cellulis clavatis, 25-40 x 8-15 µm, pigmento brunneo incrustatis. Ad terram inter folia deiecta (sub Phylloclado, Leptospermo, Cyathea, etc.). Novazelandia.

This unique species represents a new genus which has no close relationships to any of the known genera of Agaricales. Furthermore it cannot be placed in any family recognised at the present time. The name "naucorioides" is derived from the wrinkled pileus reminescent of the structure typical of many species of the genus Naucoria (Fr.) Kummer 1871.

Holotypus: PDD 27001: "Kauaeranga Valley, Coromandel Peninsula, Novazelandia: leg. Horak, 5.VII. 1968"

Material. - NEW ZEALAND: North Island, Coromandel Peninsula, Kauaeranga Valley, 5. VII. 1968, leg. HORAK (PDD 27001, holotype). - PAPUA NEW GUINEA: Morobe district, Bulolo, Manki, 1350 m, 4. VII. 1973, leg. HORAK (ZT 73/304).

Habitat. - On soil or on rotten wood in forests (under Castanopsis-Lithocarpus-Ficus in Papua New Guinea). - New Zealand (type), Papua New Guinea.

All macro- and microscopic characters observed on the Papua New Guinean material correspond with those of the type. This is only just the second record of C. naucorioides so far believed to be endemic to New Zealand. Based upon this new information it is rather likely that one day this species is also collected in other localities within Australasia (i.e. New Caledonia, Australia). Since the second species in Crucispora (C. rhombisperma, see below) is known from Japan and Indonesia (Java) C. naucorioides could also be expected in Indomalaya and/or eastern Eurasia.