Boletopsis longipes Yan C. Li & P. Lyu, 2025

Boletopsis longipes Yan C. Li & P. Lyu sp. nov.

Materials

Type status: Holotype. Occurrence: recordNumber: Yan-Chun Li 4984; recordedBy: Yan-Chun Li; individualID: KUN-HKAS 136927; occurrenceID: 29E115A4-0607-5974-AE41-A551CD8C5138; Taxon: scientificName: Boletopsis longipes Yan C. Li & P. Lyu ; kingdom: Fungi; phylum: Basidiomycota; class: Agaricomycetes; order: Thelephorales ; family: Bankeraceae ; genus: Boletopsis ; Location: higherGeography: East Asia; China; Yunnan; municipality: Lijiang; locality: Yulong Naxi Autonomous County, Laojun Mountain ; verbatimElevation: 2559 m; verbatimLatitude: 26.8451°N; verbatimLongitude: 99.8461°E; Event: eventDate: 2023-08-2 GoogleMaps

Type status: Paratype. Occurrence: recordNumber: Yan-Chun Li 5006; recordedBy: Yan-Chun Li; individualID: KUN-HKAS 136928; occurrenceID: BD33EB8B-2D6F-551A-AE9A-7C499E811D5A; Taxon: scientificName: Boletopsis longipes ; kingdom: Fungi; phylum: Basidiomycota; class: Agaricomycetes; order: Thelephorales ; family: Bankeraceae ; genus: Boletopsis ; taxonRank: species; Location: higherGeography: East Asia; China; Yunnan; municipality: Lijiang; locality: Yulong Naxi Autonomous County, Laojun Mountain ; verbatimElevation: 2559 m; verbatimLatitude: 25.2524°N; verbatimLongitude: 99.3136°E; Event: eventDate: 2023-08-25 GoogleMaps

Type status: Paratype. Occurrence: recordNumber: Mei-Xiang Li 37; individualID: KUN-HKAS 113275; occurrenceID: 3660E32E-7F39-5FA2-9E58-25733FE4D09D; Taxon: scientificName: Boletopsis longipes ; kingdom: Fungi; phylum: Basidiomycota; class: Agaricomycetes; order: Thelephorales ; family: Bankeraceae ; genus: Boletopsis ; Location: higherGeography: East Asia; China; Yunnan; municipality: Honghe; locality: Lvchun County, Huanglian Mountain ; verbatimElevation: 1000-1600 m; Event: eventDate: 2020-07-30

Type status: Paratype. Occurrence: recordNumber: Yan-Chun Li 1724; recordedBy: Yan-Chun Li; individualID: KUN-HKAS 59471; occurrenceID: DCB88158-507C-5A07-802A-DAF9A8A5A550; Taxon: scientificName: Boletopsis longipes ; kingdom: Fungi; phylum: Basidiomycota; class: Agaricomycetes; order: Thelephora; family: Bankeraceae ; genus: Boletopsis ; Location: higherGeography: East Asia; China; Yunnan; county: Baoshan; locality: Longyang, Haitang Village ; verbatimElevation: 2340 m; verbatimLatitude: 25.2524°N; verbatimLongitude: 99.3136°E; Event: eventDate: 2009-07-21 GoogleMaps

Type status: Paratype. Occurrence: recordNumber: Yan-Chun Li 1735; recordedBy: Yan-Chun Li; individualID: KUN-HKAS 59482; occurrenceID: 7B7429C6-A999-56CF-B25E-35EB64E1EFF3; Taxon: scientificName: Boletopsis longipes ; kingdom: Fungi; phylum: Basidiomycota; class: Agaricomycetes; order: Thelephorales ; family: Bankeraceae ; genus: Boletopsis ; Location: higherGeography: East Asia; China; Yunnan; county: Baoshan; locality: Longyang, Haitang Village ; verbatimElevation: 2340 m; verbatimLatitude: 25.2524°N; verbatimLongitude: 99.3136°E; Event: eventDate: 2009-07-22 GoogleMaps

Type status: Paratype. Occurrence: recordNumber: Yan-Chun Li 5844; recordedBy: Yan-Chun Li; individualID: KUN-HKAS 146814; occurrenceID: 985083D5-5A44-5287-8806-2CC18AAC20AA; Taxon: scientificName: Boletopsis longipes ; kingdom: Fungi; phylum: Basidiomycota; class: Agaricomycetes; order: Thelephorales ; family: Bankeraceae ; genus: Boletopsis ; Location: higherGeography: East Asia; China; Yunnan; stateProvince: Dali Bai Autonomous Prefecture; county: Yongping; locality: Jinguang Temple Provincial Nature Reserve ; verbatimElevation: 2371 m; verbatimLatitude: 25.1586°N; verbatimLongitude: 99.5161°E; Event: eventDate: 2024-07-27 GoogleMaps

Description

Basidiomata annual, medium to large, centrally stipitate, solitary to gregarious (Fig. 1 a View Figure 1 a , b View Figure 1 b , c View Figure 1 c ). Pileus 6.5–17 cm in diameter, convex to flat, slightly concave at centre when mature, black (4 F 8) to dark grey (13 D 1) when young, turning pastel brown (6 D 5–6 E 5) when mature; surface covered with concolorous to bark brown (3 F 3–3 F 4) tomentose squamules when mature or aged; margin undulate. Context 0.7–1.3 cm thick at centre, white (1 A 1), darkening when bruised, becoming light grey (28 A 2) when dry. Hymenophore slightly decurrent; surface white (1 A 1), becoming light grey (28 A 2) when damaged, pores subangular to angular or irregular, 2–4 per mm; tubes concolorous with hymenophoral surface, darkening when bruised, up to 0.3 cm long. Stipe 5–13 × 2–3 cm, solid, clavate to subcylindrical, concolorous with pileal surface or much paler; basal mycelium white (2 A 1).

Hyphal system monomitic. Generative hyphae with clamp connections. Basidia thin-walled, 15–36 × 7–15 μm, clavate to cylindrical, sometimes flexuous or ventricose with a peduncle, 4 - spored, clamped at base, hyaline in KOH, yellowish to pale yellow in Melzer's Reagent (Fig. 2 View Figure 2 a). Basidiospores [122 / 6 / 5] 5–7 (8) × (3.5) 4–6 μm, Q = 1–1.75, Q m = 1.21 ± 0.16, globose to oblong, acyanophilic and non-dextrinoid, hyaline to pale yellow in KOH; ornamentation on the surface tuberculate and sometimes furcate (Fig. 2 View Figure 2 b; Fig. 3 a View Figure 3 a , b View Figure 3 b ). Cystidia absent. Tube tramal hyphae thin-walled, 2–4 μm wide, cylindrical, interwoven, hyaline in KOH. Hyphae of pileipellis thin-walled, 2–7 (9) μm wide, cylindrical, interwoven and occasionally subparallel, hyaline to faint olivaceous in KOH; terminal cells (15) 18–50 (72) × (1) 3–7.5 (9) μm (Fig. 2 View Figure 2 c). Pileal tramal hyphae thin-walled, up to 26 μm wide, inflated to filamentous, interwoven, hyaline in KOH. Hyphae of stipitipellis thin-walled, 2–7 (10) μm wide, cylindrical, interwoven or subparallel, frequently branched, faint olivaceous in KOH (Fig. 2 View Figure 2 d).

Diagnosis

Boletopsis longipes differs from other species of the genus by its pastel brown pileus when mature, relatively slender stipes 5–13 × 2–3 cm, large basidia 15–36 × 7–15 μm and its occurrence in mixed forests dominated by trees of Quercus sp. and Pinus yunnanensis at an altitude ranging from 1000 m to 2600 m.

Etymology

“ Longipes ” reffering to the relatively long-footed basidiomata.

Distribution

Currently known from Yunnan Province, China.

Ecology

Growing on the ground in a moist environment in mixed forests dominated by trees of the families Fagaceae ( Quercus sp. ) and Pinaceae ( Pinus yunnanensis ).

Notes

Boletopsis longipes is characterised by its black to dark grey pileus that turns pastel brown when mature, concolorous to bark brown squamules on the surface, relatively long stipes measuring 5–13 × 2–3 cm, white mycelia at the base of stipe, large basidia measuring 15–36 × 7–15 μm and solitary to gregarious occurrence in mixed forests dominated by trees of Quercus sp. and Pinus yunnanensis at an altitude ranging from 1000 m to 2600 m. This new species represents the ninth member of the genus and the third one from China. Morphologically, B. longipes is similar to B. leucomelaena and B. watlingii in their somewhat black to brown pileus, angular to irregular hymenophoral pores and somewhat decurrent hymenophore. However, B. leucomelaena is characterised by its large hymenophoral pores 1–3 per mm (vs. 2-4 / mm in B. longipes ), bright orange mycelia at the base of stipe, narrow basidia 17–27 × 5.5–8.5 μm (vs. 15–36 × 7–15 μm in B. longipes ) and growing in dense clusters of three to ten or less often solitarily in forests dominated by trees of the genus Picea in Europe ( Niemelä and Saarenoksa 1989, Watling and Milne 2008). Boletopsis watlingii has a dark sooty-brown to greyish-brown pileus with greenish tints, white context turning greyish-violet then greyish-black (especially in the stipe) when damaged, vivid orange mycelia at the base of stipe and relatively small basidiospores measuring 4.5–4.8 (5) × 3.5–4.5 μm ( Blanco-Dios 2018). Boletopsis longipes and B. macrocarpa both have large basidiomata, white context when fresh and large basidia in Yunnan Province, China. However, B. macrocarpa has a cream to greyish-brown pileus which is up to 21 cm wide, a stout stipe which is up to 8.5 cm long and 5 cm wide and ash-grey or concolorous with pileal surface and a distribution in pure Pinus forest with altitude ranging from 2400 m to 3400 m ( Zhou et al. 2022).