Chroogomphus flavovinaceus Ayala-Vásquez, Martínez-Reyes, Pérez-Moreno, 2023

Pérez-Moreno, Jesús, Martínez-Reyes, Magdalena, Martínezgonzález, César Ramiro, Ramírez-Carbajal, Elisette, Carrera-Martínez, Anaitzi, Fuente, Javier Isaac De La, Olvera-Noriega, Joan Windhoek & Ayala-Vásquez, Olivia, 2023, Two new species of Chroogomphus (Gomphidiaceae, Boletales) with biocultural importance in the Tlahuica-Pjiekakjoo culture from Central Mexico, Phytotaxa 579 (4), pp. 289-298 : 294

Chroogomphus flavovinaceus Ayala-Vásquez, Martínez-Reyes, Pérez-Moreno , sp. nov. ( Fig. 3 )

Mycobank no. 845566, GenBank: OP580493 (ITS).

Diagnosis: — Small basidiomata, yellow citrus, pale orange, when touching vinaceous, basidiospores (14–)15–16– 17(–19) × 6.0–7.5 μm, ellipsoid to fusoid, pleurocystidia with very pronounced granular incrustation.

Type: — MEXICO, STATE OF MEXICO: Ocuilan Municipality , Lomas de Teocaltzingo Town, Quercus-Pinus forests, 462878 N; 2102619 W, 2989 m, 15 July 2021, Ayala-Vásquez O, Martínez-Reyes M., Pérez-Moreno J. ( MEXUHO 30429 , holotype) .

Description: — Pileus 25–45 mm, broadly convex, convex when young, convex-plane at mature, yellow citrus (4A6–4A8), pale orange (5A3–5A4), when touching turn vinaceous (12F8), smooth surface, margin decurvate. Lamellae subdecurrent, medium-spaced, yellow (4A4–4A5) to greyish-yellow (4AC), 5mm thick. Context 8mm thick, pale yellow (4A3) when cut context stipe base yellowish-olivaceous (2D8). Stipe 18–31 × 7–14 mm, cylindrical, slightly tapering toward the base, yellow citrus (4A7), pale orange (5A2), when touching turn vinaceous (12D8). Basal mycelium pale yellow, when touching turn olivaceous (2D6). Taste and odor not distinctive.

Basidiospores (14–)15–17(–19) × 6.0–7.5 μm, (L = 13.25, W = 6.0, Q = (2–)2.2 –2.4 (–2.6), N = 48), ellipsoid to fusoid, pale-brown to brown, smooth, with suprahilar depression, thick-walled. Basidia (31–) 40–45 (50) × (8–) 9–11 (–13) μm, clavate, hyaline in KOH, 4-sterigmata. Pleurocystidia (86–)94–110–123(–130) × (12–)15–16–18(–20) μm, fusoid, brown-chocolate in KOH, with crystal encrustations embedded in the wall, pale-yellow in Melzer’s reagent. Lamellar trama composed of inamyloid hyphae 4–6 μm, hyaline to brown-vinaceous in KOH, hyaline to pale-yellow in Melzer’s reagent. Pileipellis formed by ixotrichoderm with terminal hyphae (17–) 30–58 (68) × (7–) 10–13–15 (–17) μm, cylindrical, subfusoid, with gelatinize wall, hyaline to brown in KOH, pale yellow to brown-vinaceous in Melzer’s reagent. Stipitipellis formed by vertically intertwined hyphae (6–)8–11 μm, cylindrical, sterile. With clamp connections.

Etymology: —From latin “flavus” by the basidiomata color, “vinaceus” by the color change when touching the basidioma.

Habitat, habit, and distribution: —Solitary, forming ectomycorrhizal association with Pinus leiophylla in Quercus - Pinus forests, currently only know from the States of Mexico and Michoacán, Mexico.

Figures

FIGURE 3. Chroogomphus flavovinaceus (MEXU-HO 30429, holotype). A. Context of basidiomata. B. Basidioma. C. Change in coloration of the basidiomata when touched. D. Basidiospores. E. Cystidia. F. Basidia. G. Cystidia showing encrustations. H. pileipellis. I. terminal cells of the pileipellis. Scale bars: 10 mm (A–C); 10µm (D, F, G, I); 25 µm (E, H).