Entoloma pallidoflavum (Henn. et E. Nyman) E. Horak [as ‘pallide-flavum’]
Index Fungorum number: IF 313778
Pileus 20–40 mm broad, conical to campanulate then plano-convex with a small conical umbo or depression, slightly hygrophanous, not translucently striate, innately fibrillose, covered with tiny white filaments or glabrous, pale yellow, yellowish white (2A2–3). Lamellae adnate-emarginate with a small decurrent tooth, first cream then pinkish with serrulate concolorous edge. Stipe 40–70 × 3–6 mm, cylindrical or slightly compressed with a longitudinal groove, hollow, longitudinally fibrillose, whitish. Context whitish. Odour and taste indistinct. Spores 7.1–8.6 × 6.8–8.0 μm, Q = 1.0–1.1, cuboid to subcuboid. Basidia 42.9–56.1 × 10.5–15.7 μm, narrowly clavate, clamped. Lamellae edge sterile or heterogeneous. Cheilocystidia in dense clusters or intermixed with basidia, septate, with cylindrical to narrowly clavate terminal cells, 35.3–91.1 × 8.9–22.1 μm, colourless. Oleiferous hyphae abundant, 5–12 μm wide. Pseudocystidia present as endings of oleiferous hyphae, 65.0–154.0 × 12.5–22.1 μm, with yellowish contents. Pileipellis a cutis with transition to a trichoderm made up of cylindrical hyphae with inflated terminal elements, 7–15 μm wide. Pigment intracellular. Brilliant granules abundant. Clamp connections present.
Distribution: Java (typus), Borneo, Papua New Guinea (Horak, 1976); Vietnam.
Collections examined: Vietnam, Lam Dong Prov., Lac Duong Dist., Bidoup-Nui Ba National Park, Hon Giao Ranger Station, path to Hon Giao Mt, 12°11´32´´ N, 108°42´40´´ E, 1850 m alt., on soil in upper
montane mossy evergreen broadleaf forest, 28 June 2010, leg. O. Morozova, LE 261934. — Ibid., Giang Ly Ranger Station, 12°11´09´´ N, 108°40´56´´ E, 1450 m alt., on soil in evergreen mixed forest, 03 July 2010, leg. E. Popov, LE262932.
Additional collections examined: Malaysia, Sabah, North Borneo, Mt. Kinabalu, Kundasan, 04 Sept. 1961, leg. E. J. H. Corner, det. E. Horak, ZT Myc 3332 (Herb. Corner — RSNB 2753). — Malaysia, Sabah, North Borneo, Mt. Kinabalu, Mesilau, 05 Apr. 1964, leg. E. J. H. Corner, det. E. Horak, ZT Myc 3336 (RSNB 5715A); 19 Apr. 1964 ZT Myc 3337 (RSNB 5715 B); 27 Apr. 1964 ZT Myc 3335 (RSNB 5715 C). — Papua New Guinea, Eastern Highlands, Kassem Pass, 13 Dec. 1972, leg.and det. E. Horak, ZT Myc 3338 (Herb. Horak 72/728). Papua New Guinea, Morobe District, Bulolo, Manki,
25 Apr. 1972, leg. and det. E. Horak, ZT Myc 3330 (Herb.Horak 72/404).
Notes: Information concerning the presence of oleiferous hyphae and pseudocystidia was not provided in the previous descriptions of Entoloma pallidoflavum. Additional examination of the material collected by E. J. H. Corner and E. Horak in Borneo and Papua New Guinea allow to attribute these characteristics to the considered species. E. pallidoflavum is a typical member of the subgenus Inocephalus section Staurospora characterized by cuboid spores, presence of oleiferous hyphae, pseudocystidia and brilliant granules. It is close to E. murrayi from which differs mainly by the lack of pointed cuspidate umbo and by white stipe.