Volvariella roseostriata Jabeen & Ijaz, 2025

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 : 158-160

publication ID	https://doi.org/10.11646/phytotaxa.691.2.3
DOI	https://doi.org/10.5281/zenodo.16721865
persistent identifier	https://treatment.plazi.org/id/1951D216-FFB3-6A7A-FF6E-2F9CFDC0FE9C
treatment provided by	Felipe
scientific name	Volvariella roseostriata Jabeen & Ijaz
status	sp. nov.

Treatment

Volvariella roseostriata Jabeen & Ijaz sp. nov. Figs. 4 View FIGURE 4 , 5 View FIGURE 5

MycoBank:—MB#851392

Holotype:— PAKISTAN. Punjab, Lahore Division and District , elev. 218 m a.s.l., on soil, 28 July 2019, Aqsa Aslam 4- SJ191 ( UEH-F0014 ; GenBank: OR946478 ).

Etymology:—The specific epithet refers to the brownish pink striations on pileus.

Diagnosis:— Volvariella roseostriata is characterized by brownish pink, radially arranged tuberculate striations over a pinkish white pileal context making it distinct from V. dunensis which has a subglobose or campanulate to plano-convex, radially fibrillose or sometimes radially fissurate, grey or bluish grey pileus with some brownish tints and smaller (7.8 × 5.2 μm vs 8.3 × 6 μm) basidiospores.

Description:— Pileus 3.8–5 cm diam., flat to slightly depressed at center; central disc visible; surface dry, smooth, glabrous to very delicately fibrillose; margin uplifted, rimose, with radially arranged tuberculate striations; pinkish brown (10 R 7/2) from center to brownish pink (2.5 BG 4/2) striations over a pinkish white (5 YR 8/1) context. Lamellae free, ventricose, crowded, margin entire to slightly undulate, pink (5 YR 8/3), lamellulae of various lengths. Stipe 5.2– 8.6 × 1.1–1.3 cm, central, cylindrical, equal, base slightly bulbous, surface glabrous, smooth, white. Volva 1.5 cm in length, saccate, lobed, white, surface smooth.

Basidiospores [40/2/2] (6)6.4–10.3(10.4) × (4.6)4.8–7.1(7.4) µm, avl × avw = 8.3 × 6 μm, Q = (1.1)1.2–1.4(1.5) µm, avQ = 1.3, ellipsoid, smooth, thin-walled, guttulate, with prominent apiculus, inamyloid, hyaline in 5 % KOH. Basidia (18)19–22(24) × (7.8)8.3–11(11.4) µm, clavate to broadly clavate, with 2–4 sterigmata. Cheilocystidia (37.2)38–39.7(40.2) × (8.6)9.2–11.2(11.5) µm, clavate to utriform, narrowly fusiform and mucronate. Pleurocystidia (29.5)30–32.5(34) × (10)11.2–11.7(12) µm, narrowly fusiform to utriform, narrowly lageniform, frequent. Pileipellis hyphae (1.8)2.2–6.2(7.5) µm diam., frequently septate, clamp connections absent. Stipitipellis hyphae (2.4)2.8–4.7(4.8) µm diam., frequent, septate. Clamp connections absent in all tissues. All tissues hyaline and colorless in 5 % KOH.

Additional material examined:— PAKISTAN. Punjab, Lahore Division and District, 218 m a.s.l., on soil, 2 August 2019, Aqsa Aslam 24- SJ 291 ( UEH-F 0024! GenBank: PQ 032040).

Habitat and distribution:—Found on soil in warm semi-arid climate of Lahore, Punjab, Pakistan dominated by Alstonia scholaris , Ficus spp . and S. cumini .