Butyriboletus sinoregius L. Fan &amp; H. Y. Fu 2022, sp. nov.
Creators: name: Fu, Hao-Yu
name: Li, Ting
name: Fan, Li
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Boletales
Boletaceae
Butyriboletus
Butyriboletus sinoregius

description: <i>Butyriboletus sinoregius</i> L. Fan &amp; H.Y. Fu, <i>sp. nov.</i> 2 (Fig. 4) <i>Mycobank</i>:— MB842145 <i>Diagnosis</i>:—differs from the European <i>B. regiu</i> s by the different phylogenetic position, the basidiomes bluing when bruised and the finely tomentose pileus. <i>Etymology</i>:—‘ <i>sinoregius</i> ’; <i>sino</i>, means China, ‘ <i>regius</i> ’ refers to this new Chinese species being similar to <i>B. regius</i>. <i>Holotype</i>:— CHINA. Shanxi Province, Jincheng City, Qinshui County, Zhongcun Forest Farm, on the ground in Fagaceae forest, 35°29′8″N, 112°11′28″E, <i>elev.</i> 1630 m, 22 August 2019, collected by <i>Hong Liu LH 755</i> (BJTC FM755). <i>Description</i>:— <i>Pileus</i> 6.3–7 cm diam., convex to applanate; surface dry, sometimes cracking at centre, finely tomentose, pale purple-red (#ff6b6b), and fading to pale red-orange or grayish orange (#f8f1e2) to margin, margin straight to decurved; <i>context</i> firm and dense, thick, pale yellow (#ffff4d), becoming blue when exposed. <i>Hymenophore</i> (tube layer) surface bright yellow (#ffff1a) to pale yellow (#ffff9a) at first, turning to brownish yellow (#ebc300) when matured, becoming blue when bruised; <i>pores</i> circular to somewhat elongate, 0.3–0.7 mm diam; <i>tubes</i> 4–6 mm deep. <i>Stipe</i> 5.2–6.7 × 1.8–2.3 cm, mostly equal, sometimes slightly widening towards the base, dry, not hollow, pale yellow (#ffff4d), becoming blue when bruised, reticulate; annulus absent; <i>basal mycelium</i> whitish (#ffffff) to soft yellow (#fff281). <i>Odor</i> not distinct. <i>Taste</i> unpleasant, sour and astringent. <i>Basidiospores</i> [60/3/3] 10–15 × 5–5.5μm [Q = 2–2.68, Q m = 2.34 ± 0.34], subfusiform to fusoid-ventricose, subhyaline in KOH. <i>Basidia</i> 27.5–32.5 × 10–12.5μm, clavate, thin-walled, hyaline in KOH, 3–4-spored; sterigmata short. <i>Hymenophoral trama</i> boletoid. <i>Pleurocystidia</i> 25–42.5 × (5–) 7.5–12.5 (–17.5) μm, smooth, thin-walled, hyaline in KOH, barrel-shaped, or utriform to lageniform with subacute apex; <i>cheilocystidia</i> absent. <i>Pileipellis</i> an interwoven trichoderm, 27.5–50 μm thick, composed of interwoven hyphae, 3–5 μm in diam, hyphae yellow greenish brown (#e1f9b1), hyaline in KOH, smooth, thin-walled, terminal cells nearly clavate sometimes with expanding obtuse. <i>Stipitipellis</i> an interwoven trichoderm-like structure, 145–240 μm thick, composed of thin- to slightly thick-walled (up to 1 μm) hyphae with narrowly or broadly clavate, subfusiform or fusiform terminal cells (14–28 × 3.5–6 μm), and some emergent hyphae with clavate or subcylindrical terminal cells. <i>Stipe trama</i> composed of cylindrical, thin to slightly thick-walled (up to 1 μm), parallel hyphae 3–14 μm diam. <i>Clamp connections</i> absent. Habit, Habitat and distribution: Solitary or scattered, on ground in a Fagaceae forest dominated by <i>Quercus</i> sp., so far only known from Shanxi Province, China. Additional specimens examined: CHINA. Shanxi Province, Jincheng City, Lishan Mountains, 16 July 2020, collected by <i>Hong Liu LH 929</i> (BJTC FM1240); <i>ibid.</i> Linfen City, Yicheng Country, Shihe Forest Farm, Songshu Groove, 35°29′35″N, 112°5′41″E, <i>elev.</i> 1960 m, 26 August 2020, collected by <i>Hong Liu LH1178</i> (BJTC FM1103).
description: Published as part of <i>Fu, Hao-Yu, Li, Ting &amp; Fan, Li, 2022, Two new species of Butyriboletus from China, pp. 207-219 in Phytotaxa 544 (2)</i> on page 215, DOI: 10.11646/phytotaxa.544.2.7, http://zenodo.org/record/6503921