Helvella lacunosa Afzelius 1783

• Main Authors: Xu, Rong-Ju, Li, Lu, Zhao, Qi
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2022
• Subjects: Biodiversity; Taxonomy; Fungi; Ascomycota; Leotiomycetes; Helotiales; Chlorociboriaceae; Helvella; Helvella lacunosa; Betula nana; Lapland
• Online Access: https://doi.org/10.5281/zenodo.7036831; http://treatment.plazi.org/id/A21F8799FFCAFF9BFF6EDFCBFDC3F113

Helvella lacunosa Afzelius, 1783, Kongl. Vetensk. Akad. Nya Hand. 4: 303. FIGURE 4 Index Fungorum number : IF 495899, Facesoffungi number : FoF 02201 Neotype (here designated): SWEDEN, Lapland, Vindeljallets naturreservat, Gieravard, on the ground, under Betula nana, Salix sp., Dryas sp. forests, 20 Aug. 2010, K. Hansen, K. Gillen & I. Olariaga (KH.10.97). Pileus irregularly lobed to slightly saddle-shaped, 2–4 cm high, 2–5 cm broad, margin reflexed and fused with stipe; hymenium wrinkled to folded towards the center, taupe or nearly black when fresh, blackish when dry, receptacle surface glabrous, grey to pale greyish when fresh, becoming light blackish when dry. Stipe 3–10 cm long, 1.5–4 cm broad, lacunose, with sharp to rounded ribs, internally chambered, pubescent, taupe, yellowish brown to brownish when fresh, becoming dark brown when dry. Medullary excipulum 270–330 μm broad, of textura intricata, hyaline, composed of 3–4 μm broad hyphae, blue in cotton blue, J- in Melzer’s reagent. Ectal excipulum 50–110 μm broad, of textura angularis , outermost cells 15–37 × 7–12 μm, catenuliform in long fasciculate tufts, hyaline, evenly blue in cotton blue, J- in Melzer’s reagent. Stipitipellis 60–90 μm, hyaline, composed of cells of textura angularis , terminal cells 13–30 × 7–14 μm, clavate, with a yellow refractive content in Melzer’s reagent, blue in cotton blue. Asci arising from croziers, 8-spored, subcylindrical to clavate, with apex rounded, 230–275 × 14–17 μm, J- in Melzer’s reagent, blue in cotton blue. Paraphyses filiform, 3–5 μm broad, slightly exceeding the asci, with a slightly yellow refractive content in Melzer’s reagent, blue in cotton blue, apex slightly enlarged, 5–7 μm broad. Ascospores [40/2/2, in H 2 O] (13) 14–16 (17) × 8–11 μm [Q = (1.36–1.81), Qm = (1.52 ± 0.09)], ellipsoid, smooth-walled under the light microscope, uniguttulate, with large central globose to broadly ellipsoidal oil droplet. Asexual morph : Undetermined. Habitat: Scattered or gregarious on the ground, under Betula sp., ...