Entoloma dulciodorans Montanez, Noordeloos & Guzmán-Dávalos, 2016

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 : 213-214

1. Entoloma dulciodorans Montanez, Noordeloos & Guzmán-Dávalos , sp. nov., FIGURE 1 .

Mycobank No. 817352

Etymology:—dulcis = sweet; odorans = smelling, referring to the sweet smell of the basidiomata.

Diagnosis:—Basidiomata robust, pileus up to 115 mm diam., and stipe up to 90 × 13 mm; pileus hygrophanous, translucent-striate at the margin, fibrillose, pale greyish brown; stipe whitish; smell sweet. Pileipellis an ixocutis, hyphae with yellowish plasmatic pigment.

Description:— Pileus 35–115 mm broad, convex to plano-convex, subumbonate, hygrophanous, translucent-striate at the margin, elsewhere dull, fibrillose, smooth, pale greyish brown, sometimes with yellow tinges. Lamellae adnate to emarginate, subdistant, broad to ventricose, pink, edge entire to eroded, concolourous. Stipe 70–90 × 9–13 mm, central to slightly eccentric, cylindrical, tapering towards the base, fibrillose, longitudinally striate, whitish, some with grey fibrils. Context fleshy, white to whitish. Odour sweet like candy. Taste none to farinaceous.

Basidiospores 7.2–8.8 (–9.6) × 6.4–8.0 (–8.8) μm, Lm = 8.2, Wm = 7.4, Q = 1.0–1.3, isodiametrical to subisodiametrical, rarely heterodiametrical, 5–6 (–7) angled in side-view, colourless. Basidia 32–50 × 8–12 μm, 4- spored, cylindro-clavate, colourless, clamped. Pleurocystidia absent. Cheilocystidia absent. Pileipellis an ixocutis, terminal elements 24–30 × 4–8 μm, cylindrical to cylindro-clavate, with yellowish plasmatic pigment. Caulocystidia absent. Clamp-connections present in all tissues.

Habit and habitat:—Gregarious, on soil, in Quercus - Pinus forest.

Material studied:— MEXICO. Jalisco, Municipality of Tequila, volcán de Tequila, km 14–15 road to microwave transmission tower, 14 September 1986, O. Rodríguez 322 (IBUG!), 324 (Holotype, IBUG!).

Comments:—This species belongs to Entoloma subgen. Rhodopolia sect. Rhodopolia , particularly on account of the rather robust basidiomata, abundant clamp-connections, simple cutis-like pileipellis, and yellowish plasmatic pigment. It keys out close to E. griseoavellaneum Largent (1994) , mainly because of the fragrant smell and the not entirely smooth pileus with a fibrillose covering in the central part. However, our specimens do not have the characteristic greyish avellaneous lamellae. Also the ecology is different, as E. griseoavellaneum is associated with red alder. Largent (1994) described this species on a single specimen, thus not much is known about the variability of the species and its distribution. For this reason, we present the Mexican collection as a new species. Entoloma rhodopolium (Fr.) P. Kumm. , is distinguished by the glabrous pileus with translucent-striate margin up to half the radius, and the farinaceous or absent odour ( Hesler 1967, Largent 1994, Noordeloos 2004).

Figures

FIGURE 1. Entoloma dulciodorans. a. Basidiospores. b. Basidia. c. Pileipellis. All 1000×, except basidiospores 3000×. Drawings by Diego Montañez and Machiel Noordeloos.