Gymnopilus penetrans (Fr.) Murrill (1912: 254)

Khan, Junaid, Kiran, Munazza, Jabeen, Sana, Sher, Hassan & Khalid, Abdul Nasir, 2017, Gymnopilus penetrans and G. swaticus sp. nov. (Agaricomycota: Hymenogastraceae); a new record and a new species from northwest Pakistan, Phytotaxa 312 (1), pp. 60-70 : 62-63

Gymnopilus penetrans (Fr.) Murrill (1912: 254) ( Figures 3E–F , 4 )

Description:— Pileus 40–55 mm across, convex to plano-convex when young, becoming hemispherical to plano-convex to slightly concave at maturity, with inflexed to involute margin, yellow ochre to rusty brown (2.5YR7/8–2.5YR6/8), smooth or slightly wrinkled in dried specimens, glabrous, context pale yellow (2.5Y8/8), thicker at the center. Lamellae emarginate with a small decurrent tooth, crowded to close, rusty yellow (5YR6/6) to deep rusty brown (5YR5/6), at places stained with dark rusty brown spots, edge concolorous or somewhat paler, irregularly serrulate. Stipe 70–95 × 5–8 mm, central to slightly eccentric, cylindrical or gradually thickening downward, pale ochre (5YR8/2), brownish to rusty brown (5YR8/6), with or without white fibrillose partial veil remnants, base with white mycelium.

Basidiospores (6.6–) 7.2–9.9 (–10.6) × (3.7–) 4–5.5 (–6.1) μm, Me = 8.7 × 5 μm, Q = 1.6–1.9, Qe = 1.8, ellipsoid to oblong, verrucose to rugulose-verrucose, ornamentation moderately developed, not more than 0.2 μm high, mature spores distinctly red-brown in Melzer’s reagent (dextrinoid), yellowish brown in KOH. Basidia 20–27 × 5.8–7.4 μm, 4-spored, average sterigmata length 4.6 μm, narrowly clavate to more or less narrowly utriform. Cheilocystidia 20–30 × 6–8 μm, cylindrical, narrowly utriform to lecythiform, capitate to sub-capitate, hyaline. Pleurocystidia 15–20 × 6–8 μm, narrowly lageniform with globose head or utriform, hyaline. Pileipellis a cutis, hyphae 3–6 μm in diameter, interwoven, rusty brown, clamped septa frequent, no pileocystidia observed. Stipitipellis with hyphae 4‒6 μm in diameter, more or less parallel, hyaline, clamped at septa.

Materials examined:– PAKISTAN. Khyber Pakhtunkhwa province, Dir Upper district, Kumrat valley , 2500 m a.s.l., solitary, on mulch rich soil under Pinus wallichiana , 2 September 2015, A. N. Khalid FS 92 ( LAH35271 !) ; Swat district, Miandam , 2250 m a.s.l., in small group, on mulch-rich soil under Picea smithiana , 5 September 2013, Sana Jabeen SJ108 ( LAH35131 !) .

Figures

FIGURE 3. Basidiomes in natural habitat.A‒D. Gymnopilus swaticus, A‒B. Holotype collection, C. SWAT000134, D. LAH35300. E‒F. Gymopilus penetrans, E. LAH35271, F. LAH35131. Photos by Junaid Khan.

FIGURE 4. Microscopic structures of Gymnopilus penetrans (LAH35271). A. Basidiospores. B. Cheilocystidia. C. Basidia. D. Pleurocystidia. E. Stipitipellis. F. Pileipellis. Scale bar = 10 μm for A‒B; 8 μm for C‒D; 6 μm for E‒F. Drawings by Munazza Kiran.