NEW ZEALAND: North Island: North Auckland: Waitakere Range: Piha Valley, under L. ericoides (with Vitex, Rhopalostylis, Knightia), 2.VI.1969, leg. HORAK, PDD 27180, holotype (ZT 69/372, isotype); Mill Bay, under Leptospermum sp. (with Phyllocladus), 6.VII.1981, leg. HORAK (ZT 1052); Northcote, Kauri Glen, 8.VI.1972, leg. TAYLOR (761). - Gisborne: Urewera N. P.: Ngamoko Track, under Leptospermum-Nothofagus, 22.V.1981, leg. HORAK (ZT 640); near N. P. Headquarters, under N. fusca-menziesii, 27.V.1981, leg. HORAK (ZT 805); Lake Ruapani, under N. fusca-menziesii, 30.V.1981, leg. HORAK (ZT 825). - Wellington, Tokaanu, Lake Rotopounamu, under N. fusca, 22.V.1973, leg. TAYLOR (839). - South Island: Otago, Lake Ohau, Temple Forest, under N. solandri, 9.V.1971, leg. TAYLOR (673). - Southland, Lake Manapouri, Surprise Bay, under N. solandri (with Dacrydium, Podocarpus), 5.V.1970 leg. TAYLOR (624).

Pileus -60 mm, hemispherical or convex becoming broadly umbonate or obtusely campanulate finally depressed around umbo, margin distinctly inrolled in young specimens; centre black-olive, pale fuliginous-green or grey-green, fading towards margin to ochre-yellow or golden yellow; glutinous to viscid, remaining sticky, occasionally radially wrinkled, margin striate in aged carpophores, conspicuous veil remnants absent. - Lamellae 20-30, -7, adnate to broadly emarginate, subdecurrent with tooth, -7 mm wide; pale yellow to apricot (any green-olive tinge absent) turning yellow rust brown with age; edges concolorous, entire to serrulate. - Stipe -100 x-8 (-15 at base) mm, (sub)fusoid, subbulbous or clavate at base, rarely cylindrical, single or cespitose; pale yellow (occasionally with pale grey-olive shine); glutinous to viscid from base to subpersistent fibrillose or agglutinated cortina, apex dry, sometimes with yellow rhizoids at base; solid when young, becoming hollow. - Context pale yellow (turning brown upon bruising), distinctly olive-grey beneath cuticle of pileus. - Odour and taste acidulous to (weakly) raphanoid. - Chemical reactions on pileus (and stipe): KOH-red to red-brown. Spore print rust brown. - Spores 7-8.5-11 x (4-) 4.5-5.5 µm, oval to subelliptical, minutely verrucose but with coarse warts at apex (often embedded in perisporial remnants), rust brown. - Basidia 25-35 x 6-7 µm, 4-spored, often with purple-brown plasmatic pigment. - Cheilocystidia absent. - Pileipellis an ixocutis composed of cylindrical, strongly gelatinized, entangled hyphae (2-6 µm diam.), subcutis cellular, in KOH with brilliant red-purple both plasmatic, encrusting and intercellular pigment which scarcely dissolves in KOH, solvent stains pale olive brown, rarely with oleiferous hyphae. - Clamp connections present.

On soil both in Nothofagus and Leptospermum forests. - New Zealand.

Pileus -60 mm, ex hemisphaerico obtuse campanulatus, nigroolivaceus vel fuligineus ad apicem, luteus marginem versus, glutinosus. Lamellae emarginatae, pallide luteae. Stipes -100 x -8(-15) mm, fusoideus vel subbulbosus ad basim, luteus, glutinosus. Odor saporque (sub)raphanoidei. KOH - rubrobrunneus. Sporae 7-8-11 x (4-)4.5-5.5 µm, ex ovoideo ellipticae, verrucosae. Cystidia nulla. Ad terram in silvis Nothofagi Leptospermique. Novazelandia.

In New Zealand D. alienata represents the most common species of the genus. It is found in mixed broadleaved forests but also occurs in pure stands of both Nothofagus spp. and Leptospermum spp. Due to the olive-green tinge on the yellow pileus D. alienata is readily confused with D. olivaceonigra or D. icterinoides. According to personal experience the definite identification and/or separation of the species belonging into this complex is often not possible in the field. A thorough microscopical examination should be supported by data obtained from thin-layer chromatography of the anthraquinonoid pigments (KELLER & al., 1988). Skyrin, hypericin and to a lesser degree dermolutein are the principal pigments which are responsible for the yellow colours of D. alienata. A similar pigment pattern is also found in D. icterinoides which, however, differs not only by the presence of additional pigment components but also several other distinctive macroscopical characters.

Holotypus PDD 27180.