Gymnopilus swaticus J. Khan, Sher & Khalid, 2017

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 : 63-67

Gymnopilus swaticus J. Khan, Sher & Khalid sp. nov. ( Figures 3A‒D , 5 )

MycoBank number:—MB820555

Etymology:—the specific epithet “swaticus ” refers to the district of collection, Swat.

Diagnosis:—growth on Piceae smithiana , fruiting body 40‒70 mm across, pileus velutinous to slightly tomentose, subdistant to close and sinuate to emarginate lamellae, ellipsoid to amygdaliform basidiospores measuring 8.6–10.0 × 4.5–5.6 μm.

Type:— PAKISTAN. Khyber Pakhtunkhwa province, Swat district, Gabin Jabba valley Lalkoo, in decomposing cavities of Picea smithiana , 2483 m a.s.l., 31 August 2015, Junaid Khan GJ-1518 (Holotype SWAT000133!).

Description:— Pileus 40–70 mm across, hemispherical, convex or campanulate when young, plano-convex to plane at maturity, margin incurved to inrolled at first, becoming straight with age, yellowish orange (2.5YR8/4) to light orange (2.5YR4/6) when young, rusty yellowish orange (2.5YR5/12 to 2.5YR6/12) by maturity, surface dry, dull, pruinose to velutinous when young, velutinous to pubescent or slightly tomentose later on, context moist, solid, thicker at the center (≤ 9 mm), flesh concolorous with pileus or paler, continuous with the stipe, compact, unchanging upon cutting. Lamellae sinuate to emarginate, broad (≤ 7 mm), sub-distant to close, sulphur yellow (2.5YR5/12 to 2.5YR6/12) when young, turning rusty brown (2.5YR5/12 to 2.5YR6/12) with age with a paler margin, edge entire or slightly serrulate, lamellulae mostly in 3 tiers. Stipe 40–70 × 8–12 mm, central to slightly eccentric, terete, equal, concolorous with the pileus (2.5YR8/4 to 2.5YR4/6), velutinous to fibrillose, longitudinally striate, base covered with white mycelium especially in young stages, texture firm, interior solid, flesh concolorous with the stipe or slightly darker, especially at the center.

Basidiospores (8–) 8.6–10 (–10.5) × (3.9–) 4.5–5.6 (–6) μm, Me = 9.1 × 5.1 μm, Q = (1.6–) 1.7–2.1 (–2.3), Qe = 1.8, mostly ellipsoid to elongate, amygdaliform, rarely ovoid, verrucose, ornamentation 0.3–0.5 μm high, plage and germ pore absent, dextrinoid in Melzer’s reagent, dark brown in KOH. Basidia 30–35 × 6–8 μm, narrowly clavate, mostly 4-sterigmate, rarely 2-sterigmate, sterigmata ≤ 5 μm long, clamped at the bases, hyaline. Cheilocystidia 35–40 × 8–10 μm, scattered, narrowly utriform, narrowly lageniform, cylindrical, narrowly clavate, with capitate to sub-capitate heads, hyaline to slightly golden brown. Pleurocystidia 30–35 × 6–8 μm, narrowly utriform, slightly projecting. Pileipellis a cutis, hyphae 4–6 μm in diameter, clamped, hyaline to slightly brown, with cylindrical terminal elements. Subhymenium ramose-inflated, hyphae ≤20 μm in diameter, with clamps, hyaline.

Habitat:—in small scattered groups, in decomposing cavities of standing trees of Picea smithiana .

Additional specimens examined:— PAKISTAN. Khyber Pakhtunkhwa province, Swat district, Gabin Jabba valley Lalkoo, 2483 m a.s.l., 8 July 2016, Junaid Khan GJ-1640 ( SWAT000134 !) ; 15 September 2016, Junaid Khan GJ-1612 ( LAH35300 !) .

Known distribution:— Pakistan, Khyber Pakhtunkhwa province, Swat district, Gabin Jabba valley.

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 5. Microscopic characters of Gymnopilus swaticus (SWAT000133).A. Cheilocystidia. B. Pleurocystidia. C. Basidiospores. D. Pileipellis. F. Basidia. Scale bar = 10 μm for A & C; 8 μm for B, D & E. Drawings by Junaid Khan.