Gliophorus glutinosus K. Das, D. Chakr. & Vizzini

Chakraborty, Dyutiparna, Das, Kanad & Vizzini, Alfredo, 2018, Gliophorusglutinosus sp. nov. (Hygrophoraceae, Agaricales) from Eastern Himalayan region of India, MycoKeys 44, pp. 123-135 : 126-129

Gliophorus glutinosus K. Das, D. Chakr. & Vizzini sp. nov. Figs 3, 4

Diagnosis.

Distinguished from all the allied taxa by its nrITS sequence and possessing a combination of features like typically twisted stipe submerged under thick gluten, sticky pileus, presence of gluten at lamellar edge, decurrent lamellae, indistinct odour, ixocheilocystidia and presence of pleuropseudocystidia and absence of clamps in pileipellis hyphae.

Type.

INDIA. Sikkim: South District, Thangse, 1962 m alt., 27°18.496'N, 88°21.519'E, 23 August 2017, D. Chakraborty & K. Das, DC 17-28 (Holotype CAL!).

Etymology.

The epithet “glutinosus” refers to the highly glutinous stipe surface.

Pileus 5-20 mm diam., convex with a shallow central depression at disc when young, becoming plano-convex at maturity; surface highly glutinous, sticky, sulcate-striate, greyish-orange (6C−B5), brownish-orange (5C5), becoming pale orange to orange white (7C7, 6A3−2) with maturity, sometimes whitish to pastel yellow (2A4) at centre; margin crenate; context ≤ 2 mm thick, concolorous with pileus surface. Lamellae subdecurrent to decurrent, moderately close to subdistant (11 per 10 mm at pileus margin), viscid, pale orange to orange white (5A3−2); lamellulae in 3 series; edges glutinous, concolorous with face of lamellae, viscid. Stipe 10−60 × 2−5 mm, central, hollow, cylindrical, often gradually broaden towards base, twisted, longitudinally furrowed, submerged under thick sticky gluten (1 mm); surface upper half pale orange (5A3) and pale yellow to light yellow (4A3−4) towards base. Taste and odour indistinct. Spore print not obtained.

Basidiospores 6−7−8 × 3−4.1−5 μm (n = 30, Q = 1.5−1.72−2.16), elongate-ellipsoid to nearly cylindric, smooth, thin-walled, hyaline, inamyloid, uni- to multiguttulate. Basidia 30-38 × 5-7 μm, clavate, thin-walled, with a basal clamp-connection, 2- to 4-spored; sterigmata up to 10 μm long. Lamellar edge sterile. Cheilocystidia 35-62 × 2-5 μm, slender, occasionally septate, mostly clustered together, gelatinised (embed ded in gelatinous matrix). Pleuropseudocystidia 31-40 × 5-7 μm, rare, subclavate to appendiculate or fusoid. Subhymenium 16-23 µm thick, not gelatinised. Hymenophoral trama subregular, consisting of clamped hyphae (3-10 μm diam.), terminal and subterminal cells 17-48 µm long, terminal cells often inflated. Pileipellis an ixocutis (when mounted in water or cotton blue), 25−60 μm thick, submerged under thick gluten (seen when mounted with cotton blue), composed of suberect, thin-walled, septate and frequently branched hyphae (observed when mounted in 5% KOH making it free from gluten); terminal elements 15-40 × 2-5 μm, with rounded apex, clamps absent. Stipitipellis an ixocutis (when mounted in water or cotton blue) to an ixotrichoderm (when revived in KOH), mostly similar to that of pileipellis.

Habitat/ Distribution.

Growing in groups or gregariously on soil amongst leaf-litter of angiospermous plants.

Additional specimen examined.

INDIA. Sikkim: South District, Thangse, 1962 m alt., 27°18.496'N, 88°21.519'E, 23 August 2017, D. Chakraborty & K. Das, DC 17-38 (CAL).