Boletopsis macrocarpa Y. C. Dai, F. Wu & H. M. Zhou 2022

Boletopsis macrocarpa Y. C. Dai, F. Wu & H. M. Zhou, 2022 Materials Type status: Other material. Occurrence: recordNumber: Yan-Chun Li 6792; recordedBy: Yan-Chun Li; individualID: KUN-HKAS 139404; occurrenceID: 65D47339-9FC0-5C0C-91CF-D62C94AA58C6; Taxon: scientificName: Boletopsis macrocarpa; kingdom: Fungi; phylum: Basidiomycota; class: Agaricomycetes; order: Thelephora; family: Bankeraceae; genus: Boletopsis; Location: higherGeography: East Asia; China; Yunnan; county: Yulong Naxi Autonomous County; locality: Laojun Mountain; verbatimElevation: 2575 m; verbatimLatitude: 27.0777°N; verbatimLongitude: 99.7100°E; Event: eventDate: 2024-08-29 Type status: Other material. Occurrence: recordNumber: Zhen Wang 119; recordedBy: Zhen Wang; individualID: KUN-HKAS 120843; occurrenceID: 28E8D6D4-567F-504F-8849-420354D2F20F; Taxon: scientificName: Boletopsis macrocarpa; kingdom: Fungi; phylum: Basidiomycota; class: Agaricomycetes; order: Thelephora; family: Bankeraceae; genus: Boletopsis; Location: higherGeography: East Asia; China; Yunnan; county: Diqing Tibetan Autonomous Prefecture; locality: Shangri-La, Geza Village; verbatimElevation: 3377 m; verbatimLatitude: 28.0173°N; verbatimLongitude: 99.7883°E; Event: eventDate: 2019-08-16 Type status: Other material. Occurrence: recordNumber: Xiang-Hua Wang 6104; recordedBy: Xiang-Hua Wang; individualID: KUN-HKAS 116743; occurrenceID: BD67534C-6120-5E0D-B08A-4E81AB7328D5; Taxon: scientificName: Boletopsis macrocarpa; kingdom: Fungi; phylum: Basidiomycota; class: Agaricomycetes; order: Thelephora; family: Bankeraceae; genus: Boletopsis; Location: higherGeography: East Asia; China; Yunnan; county: Diqing Tibetan Autonomous Prefecture; locality: Shangri-La, Geza Village; verbatimElevation: 3377 m; verbatimLatitude: 28.0173°N; verbatimLongitude: 99.7883°E; Event: eventDate: 2019-08-16 Description Basidiomata annual, medium to large, centrally stipitate, solitary to gregarious (Fig. 1 d, e). Pileus 6.5–21 cm in diameter, roundish to irregular, slightly depressed at centre, cream (5 A 2) to greyish-brown (5 E 6), becoming pale brownish-grey (5 D 3) to black when dry; margin occasionally cream, undulate. Context white (1 A 1), becoming pale mouse-grey (2 B / C 2) when dry. Hymenophore slightly decurrent; surface white (1 A 1) to cream (5 A 2), becoming clay buff (6 D 4) to fawn (7 D / E 4) when dry, pores subangular to angular or irregular, 1–3 per mm; tubes concolorous with hymenophoral surface, turning fawn (6 D 7) when bruised, up to 0.5 cm long. Stipe up to 8.5 cm long and 5.5 cm wide, solid, subcylindrical, pale ash-grey (17 B 1) or concolorous with pileal surface. Hyphal system monomitic. Generative hyphae with clamp connections. Basidia thin-walled, 18–45 × 5.5–10 μm, clavate to cylindrical, sometimes flexuous or ventricose with a peduncle, 4 - spored, clamped at base, hyaline in KOH (Fig. 4 a). Basidiospores [60 / 3 / 3] (4.5) 5–6 × (3.5) 4–5 (5.5) μm, Q = 1–1.38 (1.5), Q m = 1.20 ± 0.13, globose to oblong, acyanophilic and non-dextrinoid, hyaline to pale yellow in KOH; ornamentation on the surface tuberculate and sometimes furcate (Fig. 3 c, d; Fig. 4 b). Cystidia absent. Tube tramal hyphae thin-walled, 2–4 μm wide, cylindrical, interwoven and occasionally subparallel in a bunch, hyaline in KOH. Hyphae of pileipellis thin-walled, 3–9 μm wide, cylindrical, interwoven and occasionally subparallel, hyaline to faint olivaceous in KOH; terminal cells 22–53 (56) × (3) 4–7 (9) μm (Fig. 4 c). Pileal tramal hyphae thin-walled, 4–44 μm wide, inflated, sometimes branched, interwoven, hyaline in KOH. Hyphae of stipitipellis thin-walled, 3–20 μm wide, cylindrical, parallel, rarely branched, faint olivaceous in KOH. Distribution Currently known from Yunnan Province, China. Ecology Growing on the ground in the pure coniferous forests dominated by trees of the genus Pinus (Pinus yunnanensis) at an altitude ranging from 2400 m to 3400 m. Notes Boletopsis macrocarpa is characterised by its large pileus (6.5–21 cm wide) with cream to greyish-brown surface, white to cream hymenophoral surface, solitary to gregarious in coniferous forests of Pinus yunnanensis in slightly dry environments at a high altitude ranging from 2400 m to 3400 m. Morphologically, B. macrocarpa is similar to B. grisea in their somewhat greyish-tinged pileus, white to cream hymenophoral surface and distribution in the pure Pinus forests. However, B. grisea originally described from Europe is characterised by its grey pileus, short stipes 2–6 cm long (vs. 8.5 cm long in B. macrocarpa), small pores 2–4 / mm (vs. 1–3 / mm in B. macrocarpa), gloeoplerous hyphae in pileipellis and narrow basidiospores (4.2) 5–6 (6.5) × (3.2) 3.9–4.5 (5.1) [vs. (4.5) 5–6 × (3.5) 4–5 (5.5) μm in B. macrocarpa] (Peck 1873, Niemelä and Saarenoksa 1989). In our re-examination of B. macrocarpa, we found larger basidia measuring 18–45 × 5.5–10 μm (14–19 × 6–7 μm in the protologue) and wider hyphae of pileal trama measuring 4–44 μm wide (5–25 μm wide in original description) than those in the protologue of Zhou et al. (2022).