Volvariella pilosipilea, Caballero, Fernando, Justo, Alfredo, Parra, Luis A., Angelini, Claudio, Consiglio, Giovanni, Dovana, Francesco, Ferisin, Giuliano, Kaygusuz, Oğuzhan, Knudsen, Henning, Llimona, Xavier, Muñoz, Guillermo, Daniëls, Pablo P., Pérez-De-Gregorio, Miquel À., Ševčíková, Hana, Valverde, Andrés & Vizzini, Alfredo, 2025
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publication ID |
https://doi.org/10.11646/phytotaxa.680.1.1 |
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persistent identifier |
https://treatment.plazi.org/id/A01487E4-FFAD-FF91-FF2E-FE35F7AFF9CA |
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treatment provided by |
Felipe |
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scientific name |
Volvariella pilosipilea |
| status |
sp. nov. |
25. Volvariella pilosipilea F. Caballero, Justo , Pérez-del-Amo & C. Roqué, sp. nov. ( Fig. 33 View FIGURE 33 ).
MycoBank: MB 856542
Typification:— Holotype: SPAIN. Navarra, Lana, on the bed of the Gastiain river , near its confluence with the Ega River , on rocks rich in chalk, 1 August 2020, Grupo Micológico Verpa, AH 60256! (Isotype: CMP2077 ).
Etymology:—From the Latin “ pilosus ” hairy and “ pileus ” pileus, for its fibrillose-lanose pileus surface.
Diagnosis:— Volvariella pilosipilea , is characterized by the small size and fragile aspect, white, lanose-fibrillose pileus surface, smooth and translucent stipe, and a small, white delicate volva.
Description:— Pileus 6–11 mm diam., ovoid when young, then conical to campanulate, and plano-convex in older specimens, with or without a central umbo; surface fibrillose-lanose, covered with radial fibrils tending to group into minute squamules, especially towards the margin, not hygrophanous, pure white; margin smooth, slightly exceeding the lamellae and irregular. Lamellae crowded, free, broadly ventricose, white when young, becoming salmon pink or pinkish brown with age; edge entire, or irregular, white or concolourous. Stipe 6–13 × 0.5–2 mm, cylindrical, slightly widening towards the base, straight or slightly curved; surface white, with a semitranslucent aspect, smooth. Volva membranaceous, saccate, fragile, pure white or with some brown tints, with 2–4 lobes; rhizomorphs not observed. Context white, thin, with indistinct smell.
Basidiospores (n=155, c=2) 5.6–8.2 × 4.5–5.9 μm, avl × avw = 6.6 × 5.1 μm, Q = 1.12–1.51, avQ = 1.29, subglobose to ellipsoid, thick-walled, with barely distinct hilar appendage. Basidia 22–43 × 8–10 μm, tetrasterigmate, clavate, subclavate or subcylindrical. Lamella edge heterogeneous. Cheilocystidia common, (35–)44–83(–95) × (9–)13–24(–31) μm, most lageniform, with narrowing apex, some fusiform or utriform. Pleurocystidia scarce, 30–88 × 8–31 µm, most lageniform or fusiform. Pileipellis a cutis or an intermediate cutis-trichoderm, with terminal elements (9–)15–23(–31) μm wide, often constricted at the septa, mostly hyaline. Stipitipellis a cutis, or a cutis-trichoderm in the upper part of the stipe, with cylindrical hyphae 3–17 μm wide. Volva composed of interwoven, cylindrical hyphae, 3–28 μm wide, with common septa; individual segments often constricted at the septa, with some isolated ovoid or ellipsoid elements, up to 42 µm in diameter. Clamp connections absent in all parts examined.
Habit, habitat, and phenology:—Gregarious. Terrestrial, in very clay-rich soils, near streams or in gardens with clay-rich soils and lots of organic matter. August–October.
Distribution:— Spain.
Additional collection examined:— SPAIN. Lleida: Torres de Sanui, in a garden with clay-rich soil and abundant organic matter, 31 October 2005, C. Roqué, CR31102005-8.
Observations:— Volvariella pusilla differs in the larger basidiomes (pileus up to 50 mm diam.) and broader hyphae on the pileipellis (15–50 µm diam.). Volvariella hypopithys has larger basidiomes (pileus up to 35 mm diam.), longer cheilocystidia (up to 124 µm), and globose elements in the external part of the pileipellis (25–120 × 23–108 µm). For comparison with other species see Tables 1 and 2.
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