Butyriboletus brunneoides 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 brunneoides

description: <i>Butyriboletus brunneoides</i> L. Fan &amp; H.Y. Fu, <i>sp. nov.</i> 1 (Fig. 3) <i>Mycobank</i>:— MB842144 <i>Diagnosis</i>:—differs from <i>Bu. brunneus</i> in the small to medium basidiome with a smooth pileus, a thin stipe that develops reddish stains at the base and the isolated phylogenetic position. <i>Etymology</i>:—‘ <i>brunneoides</i> ’, refers to the similarity to <i>Bu. brunneus</i>. <i>Holotype</i>:— CHINA. Shanxi Province, Jincheng City, Qinshui County, Shangwoquan village, 35°35ʹ1ʺN, 112°4ʹ37ʺE, <i>elev.</i> 1150 m, on the ground under <i>Quercus spp</i>., 26 July 2021, collected by <i>Jingchong Lv LJC045</i> (BJTC FM1816). <i>Description</i>:— <i>Pileus</i> 3.5–9.4 cm in diam., hemispherical to convex, becoming broadly convex when mature; surface dry, smooth, yellowish brown (#ffbb78) to brown (<b>#</b> c96400), margin decurved; <i>context</i> firm and dense, thick, pale yellow (#ffff68) to yellow (#fffc9a), unchanging when exposed, or turning very slightly pale blue over the tubes. <i>Hymenophore</i> (tube layer) bright yellow (#ffff1a) to light yellow (<b>#</b> eaff80), changing blue when exposed; <i>pores</i> circular to somewhat elliptical, 0.2–0.3 mm in diam; <i>tubes</i> 2–5 mm deep. <i>Stipe</i> 4.5–6 × 0.7–3 cm, cylindrical, equal, widening towards the base, dry, solid, covered with a fine yellow reticulum; pale yellow (<b>#</b> eaff80), developing pale red stains near the base changing blue when bruised; annulus absent. <i>Basal mycelium</i> whitish (#ffffff) to pale yellow (#fff281). <i>Odor</i> distinct like salted fish when dry. <i>Taste</i> unpleasant, typically bitter or somewhat tart. <i>Basidiospores</i> [40/2/2] 11–15(–17) × 3–5 [Q = 3.25–3.75 (4.33), Q m = 3.5 ± 0.25], subfusiform, subhyaline in KOH. <i>Basidia</i> 27.5(–15)–35 × 7.5–10 μm, clavate, thin-walled, 4-spored; sterigmata short. <i>Hymenophoral trama</i> boletoid. <i>Pleurocystidia</i> 35–45 × 8–12.5 μm, smooth, thin-walled, hyaline in KOH, fusoid-ventricose to broadly clavate with subacute apex; <i>cheilocystidia</i> 30–32.5 × 7.5–10 μm, smooth, thin-walled, hyaline in KOH, narrowly clavate to clavate-ventricose. <i>Pileipellis</i> an interwoven trichoderm 37.5–50 μm thick, composed of interwoven hyphae 2.5–5 μm in diam., hyphae yellowish brown (#edb849), hyaline in KOH, smooth, thin-walled, terminal cells cylindric with subglobose or rounded apices. <i>Stipitipellis</i> an interwoven trichoderm-like structure 105–200 μm thick, composed of thin- to slightly thick-walled (up to 1 μm) hyphae with narrowly or broadly clavate, subfusiform or fusiform terminal cells (16–26 × 4–9 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, currently only known from Shanxi Province, North China.
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 pages 213-215, DOI: 10.11646/phytotaxa.544.2.7, http://zenodo.org/record/6503921