Entoloma cf. subcoelestinum (Largent) Blanco-Dios (2015: 37)

Montañez, Diego, Noordeloos, Machiel E., Rodríguez, Olivia, Vargas, Ofelia & Guzmán-Dávalos, Laura, 2016, Notes on the genus Entoloma (Basidiomycota, Agaricales) in two volcanic areas of Jalisco, Mexico, Phytotaxa 277 (3), pp. 211-236 : 230-231

14. Entoloma cf. subcoelestinum (Largent) Blanco-Dios (2015: 37) , FIGURE 14 .

≡ Leptonia subcoelestina Largent (1977: 107)

Description:— Pileus 5 mm broad, plano-convex, depressed, dry, dull, centre appressed-squamulose, elsewhere fibrillose, striate at the margin, greyish black with violet tinges. Lamellae adnate, distant, pink with grey tinges, edge entire, concolourous. Stipe 15 × 1 mm, eccentric, cylindrical, slightly broadening towards the base, glabrous, with pruinose apex, smooth, concolourous with pileus, grey at the base. Context thin, grey. Odour none. Taste none.

Basidiospores 8.0–9.6 (–11.0) × 5.6–6.4 μm, Lm = 9.1, Wm = 6, Q = 1.3–2.0, heterodiametrical, rarely subisodiametrical, 6–7 angled in side-view, colourless. Basidia 35–54 × 8–12 μm, 4-spored, clavate, colourless, clamped. Pleurocystidia absent. Cheilocystidia absent. Pileipellis a trichoderm at the centre, terminal elements 26–80 × 6–25 μm, cylindro-clavate, oblong, subfusiform, some with mucronate apex, a cutis at the margin; with greyish blue plasmatic pigment. Caulocystidia 16–46 × 5–10 μm, cylindro-clavate, lageniform, subfusiform, utriform, colourless, in groups at the stipe apex. Clamp-connections present in all tissues except the pileipellis.

Habit and habitat:—Solitary, on soil, in cloud forest, with Abies , Quercus , Pinus , and Clethra , among others.

Material studied:— MEXICO. Jalisco, Municipality of Zapotlán el Grande, El Floripondio, slopes of Nevado de Colima, 17 August 2011, C. Torres-Preciado 259 (IBUG!).

Comments:—The Mexican specimen keys out in Entoloma subgen. Leptonia sect. Leptonia very close to L. subcoelestina , in particular due to the peculiar cystidiform elements of the pileipellis and the absence of clamp-connections. Furthermore, this species is characterized by the very small basidiomata and the basidiospores measuring 8.0–11 × 5.5–7 μm with conspicuous angles ( Largent 1994). However, this species is only known from its type-locality in Washington State, USA, growing in the coniferous humus layer ( Largent 1977, 1994). For this reason, we hesitate to confirm the conspecificity. Similar species are E. coelestinum (Fr.) Hesler (1967) from Europe and North America, with smaller basidiospores ( Largent 1994, Noordeloos 2004, Morozova et al. 2015); E. cyaneum Saccardo (1887) with larger and nodulose-angled basidiospores; E. chytrophilum with a lignicolous habit and nodulose-angled basidiospores (see also above); and E. lepidissimum Noordeloos (1982b) with nodulose-angled basidiospores, blue lamellae when young, and sometimes distinctly developed cheilocystidia ( Noordeloos 1992, Largent 1994, Morozova et al. 2015).

Figures

FIGURE 14. Entoloma subcoelestinum. a. Basidiospores. b. Basidia. c. Pileipellis. d. Caulocystidia. All 1000×, except basidiospores 3000×. Drawings by Diego Montañez and Machiel Noordeloos.