[GS]Pileus 3-7 cm. diam., pale buff, plane with a down curved margin, matt; flesh thin, whitish. Gills sinuate, buff, moderately distant. Stipe 4-6 X 0-5-1 cm., buff, striate, hollow, tough, tapering slightly to somewhat swollen base. Spores 5-5 X 2.5um, non-amyloid, thin-walled, hyaline (Fig. 1/18). Cuticle of appressed hyphae, mainly of large diam., 5-10um. Hymenophoral trama sub-regular, of large diam. hyphae. Slight sour smell. HABITAT: among litter under Nothqfagus, Spooner's Range, Nelson, 20.5.1956. [EH] This species is a typical Tricholoma. The cuticle is formed by slightly gelatinised, cylindrical, repent hyphae without clamp connections. Spores are elliptical to subcylindric, hyaline, neither amyloid nor dextrinoid, smooth, 4.5-5 X 2-2.5 um. Cystidia none. [JAC] all tissue spreading easily in KOH, The dried material does have the look of a Tricholoma. Cap an unclamped cutis. No sign of gelatinisation. Spores length=4.1–5.4µm (µ=4.6, σ=0.32), width=2.2–2.7µm (µ=2.4, σ=0.16), Q=1.7–2.1µm (µ=1.90, σ=0.10), n=20. Definitely no tissue amyloid or dextrinoid. The spores are very small and do not have the glassy look typical of Tricholoma. Nevertheless I agree with Horak this must be a (overlooked) Tricholoma.

Collybia bubalina Stevenson (29D) = Tricholoma bubalinum (Stevenson) comb. nov. (Basionym: C. bubalina Stevenson, Kew Bull. 19: 9, 1964) This species is a typical Tricholoma. The cuticle is formed by slightly gelatinised, cylindrical, repent hyphae without clamp connections. Spores are elliptical to subcylindric, hyaline, neither amyloid nor dextrinoid, smooth, 4.5-5 X 2-2.5 µ. Cystidia none.

[Notes from Kew Type specimen, PRJ 2010] Kew images.

Pileus 3-7 cm diam., pale buff, plane with a down curved margin, matt; flesh thin, whitish. Gills sinuate, buff, moderately distant. Stipe 4-6 x 0.5-1 cm buff, striate, hollow, tough, tapering slightly to somewhat swollen base. Spores 5.5 x 2.5 µm non-amyloid, thin-walled, hyaline (Fig. 18). Cuticle of appressed hyphae, mainly of large diam., 5-10 µm. Hymenophoral trama sub-regular, of large diam. hyphae. Slight sour smell.

Among litter under Nothofagus, Spooner's Range, Nelson, 20.5.1956, Stevenson (type).

Pileus 3-7 cm diam., pallide bubalinus, planus, margine deorsum in-curvato, haud lucens; carne tenui albida. Lamellae sinuatae, bubalinae, modice distantes. Stipes 4-6 x 0.5-1 cm, bubalinus, striatus, cavus, tenax, basin subtumidam versus leviter attenuatus. Sporae 5.5 x 2.5 µm haud amyloideae, parietibus tenuibus, hyalinae. Cuticula ex hyphis adpressis diametro plerumque magnis (5-10 µm) sistens. Trama hymenophoralis subregularis, ex hyphis plerumque diametro magnis sistens. Odor levis, acidulus.

Typus: Stevenson 1098.