Volvariella bombycina (Schaeff.) Singer (1951)

Jabeen, Sana, Ijaz, Hira, Ullah, Sadiq, Shahid, Aleena, Sharif, Muhammad Bilal, Aslam, Aqsa, Saeed, Anum, Usman, Muhammad & Khalid, Abdul Nasir, 2025, New and noteworthy Volvariella spp. (Volvariellaceae) from Pakistan, Phytotaxa 691 (2), pp. 151-172 : 162

Volvariella bombycina (Schaeff.) Singer (1951) Lilloa 2: 401. Figs. 8 , 9

Description:— Pileus 5.2 cm diam., obtuse to convex, surface dry, squarrose covered with silky hairs, margin serrate, hairy, white, extending 3–4 mm beyond lamellae. Context shiny white. Lamellae free, crowded, ventricose, light pink (2.5YR7/8), margin entire, lamellulae frequent, of variable lengths. Stipe 4.7 × 0.6 cm, central, equal to slightly broadened towards base, often curved, fibrillose, minutely pubescent, white. Volva saccate, cartilaginous, irregularly lobed, with woolly outer surface, light brown (10YR5/8) with brown (2.5YR4/6) patches. Annulus absent.

Basidiospores [20/1/1] (7.5)7.6–8.9(9.4) × (5.4)6.1–6.3(6.5) µm, avl × avw = 8.2 × 6.2 μm, Q = 1.3–1.5, avQ = 1.3, broadly ellipsoid to ellipsoid, smooth, thin-walled, guttulate, with prominent apiculus, inamyloid, hyaline in 5 % KOH. Basidia (43.1)44.3–63.1(65.7) × (15.4)16.1–17.2(18.5) µm, clavate, with 2–4 sterigmata, thick-walled. Cheilocystidia (37.6)38.1–44.9(48.1) × (12.8)13.1–15.9(17.1) µm, clavate to lageniform, fusiform, utriform. Pleurocystidia (33.1)38.7–43.5(45.4) × (16.7)17.9–19.4(20.6) µm, fusiform, utriform, rarely flexuous, abundant. Pileipellis a cutis made up of septate hyphae (4.5)5.3–6.4(6.6) µm diam. without clamp connections. Stipitipellis hyphae (4.8)5.1–5.9(6.1) µm diam., septate, branched. Clamp connections absent. All tissues hyaline and colorless in 5 % KOH.

Material examined:— PAKISTAN. Khyber Pakhtunkhwa, Malakand division, Shangla District, elev. 2000 to 3000 m a.s.l., on wood of P. wallichiana , 11 August 2015, Sadiq Ullah 631SJ172 (UEH-F0013! GenBank: OR946479).

Figures

FIGURE 8. Volvariella bombycina. a, b. (UEH-F0013). Scale bar = 1 cm. Photographs by Sadiq Ullah.

FIGURE 9. Volvariella bombycina UEH-F0013. a. Basidiospores. b. Basidia. c. Cheilocystidia. d. Pleurocystidia. e. Pileipellis. f. Stipitipellis. Scale bars: a–f = 10 µm. Drawings by Sana Jabeen.