Volvariella bilobata AK. Dutta & Chattopadhyay (2022) Phytotaxa

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 : 160

Volvariella bilobata AK. Dutta & Chattopadhyay (2022) Phytotaxa 567: 36–48. Figs. 6 , 7

Description:— Pileus 1.5–4.1 cm diam., convex to applanate with a broad umbo at maturity; surface dry, shiny, fibrillose, margin striate, brownish grey (5PB3/1) to blackish grey (N3). Lamellae free, crowded, regular, margin even to fimbriate, light pink (10RP9/2) to brownish pink (5R7/3), lamellulae frequent, of variable lengths. Stipe 2.4–8.1 × 0.5–0.9 cm, cylindrical, central, surface slightly fibrillose, equal to slightly broad towards base, smooth, white. Annulus absent. Volva 2–2.5 cm in length, saccate, bilobed, margin even, white to brownish (N2) from the outer margin, light pink (10P9/2) from inner side.

Basidiospores [60/5/2] (4.2)4.3–5.9(6.1) × (3.6)3.7–4.5(4.7) µm, avl × avw = 5.1 × 4.1 μm, Q = 1.16–1.29, avQ = 1.23, ellipsoid to broadly ellipsoid, smooth, apiculus prominent, monoguttulate, inamyloid, yellowish green in 5 % KOH. Basidia (15.5)15.8–22(24.1) × (8.1)8.3–11.2(11.6) µm, broadly clavate, 2–4 sterigmata. Cheilocystidia (30)32– 50(52) × (12)13.4–28.7(30) µm, clavate to ventricose-lageniform, fusiform or utriform, thin-walled. Pleurocystidia (22)24–25.3(34) × (6.1)7.3–9(10.5) µm, lageniform to mucronate. Pileipellis hyphae (2.7)2.8–5.5(5.6) µm diam., frequently septate, branched. Stipitipellis an intricate trichoderm, made up of septate hyphae (3.2)3.4–5.3(5.4) µm diam. Clamp connections absent. All tissues hyaline in 5 % KOH.

Material examined:— PAKISTAN. Punjab, Lahore division, Kasur District , Changa Manga Forest , elev. 192 m a.s.l., on soil, 5 September 2020, Sana Jabeen SJ 13 ( UEH-F0011 ) ; SJ14 ( UEH-F0012 ) ; GenBank: OR935836 (ITS).

Figures

FIGURE 6. Volvariella bilobata. a, b. UEH-F0011. c, d. UEH-F0012. Scale bars a–d = 2 cm. Photographs by Sana Jabeen.

FIGURE 7. Volvariella bilobata UEH-F0012. a. Basidiospores. b. Basidia. c. Cheilocystidia. d. Pleurocystidia. Scale bars = 5 µm. Drawings by Sana Jabeen.