Tylopilus yangzhuliangii N. K. Zeng, Yi Wang, Xu Zhang & Zhui Li 2022, sp. nov.
Creators: name: Li, Zhui
name: Zhang, Xu
name: Jiang, Shuai
name: Ji, You-Dong
name: Wang, Yi
name: Zeng, Nian-Kai
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Boletales
Boletaceae
Tylopilus
Tylopilus yangzhuliangii

description: Tylopilus yangzhuliangii N.K. Zeng, Yi Wang, Xu Zhang & Zhui Li, sp. nov. (Figs. 2, 3)
MycoBank: MB842386
Etymology:—Latin, ‘ yangzhuliangii ’ is named after the Chinese mycologist, Zhu L. Yang, in honor of his great contribution to mycology.
Diagnosis:—Characterized by very small basidiomes, a peacock blue to deep turquoise pileus, the hymenophore bruising reddish brown when injured, and a slightly interwoven trichodermium composed of uninflated hyphae forming the pileipellis.
Holotype:— CHINA. Hainan Provice: Yinggeling of Hainan Tropical Rainforest National Park, elev. 850 m, 7 May 2018, N. K. Zeng 3358 (FHMU2930). GenBank accession number: 28 S = MW 826997, ITS = MW 830253, TEF1 = MW 925820.
Description:— Basidiomes very small. Pileus 0.8–2 cm in diam, subhemispherical at first, then convex to applanate; margin curved downwards; surface dry, nearly glabrous, peacock blue (24D6–7) to deep turquoise (24F8); context about 0.7 cm thick in the center of the pileus, white, unchanging in color when injured. Hymenophore poroid, adnate or slightly depressed around apex of stipe; tubes about 0.6 cm in length, white (1A1), bruising reddish brown (7E8) slowly when injured; pores angular to almost round, about 0.3 cm in diam, white (1A1), turning reddish brown (7E8) slowly when injured. Stipe 3–3.6 × 0.3–0.6 cm, central, sub-cylindrical, solid, usually flexuous; surface white (1A1), bruising brownish (7E8) when injured; context white (1A1), unchanging in color when injured; basal mycelium white (1A1).
Basidia 14–37 × 8–10 μm, clavate, thin- to slightly thick-walled (up to 1 μm), 4-spored, colorless in KOH; sterigmata 2–4 μm in length. Basidiospores [120/6/2]8–10.5(–11) × 4.5–5.5(–6) μm, Q=1.58–2.00 (–2.10) μm, Qm=1.88 ± 0.12, subfusiform to ellipsoid, slightly thick-walled (up to 0.5 μm), pale yellowish brown to yellowish brown in KOH, smooth. Cheilocystidia 35–50 × 10–15 μm, subfusiform or fusiform, thin-walled, usually containing yellow to brownish yellow pigments. Pleurocystidia 40–60 × 13–17 μm, subfusiform or fusiform, usually containing yellow to brownish yellow pigments. Pileipellis a slightly interwoven trichoderm 50–160 μm thick, composed of hyphae yellowish in KOH, 2–7 μm wide, thin-walled; terminal cells 17–47 × 4–8 μm, sub-cylindrical. Pileal trama made up of hyphae 3–6 μm in diam, yellowish in KOH. Stipitipellis a hymeniderm 160–280 μm thick, composed of thin-walled, emergent hyphae with clavate, subclavate or subfusiform terminal cells (25–44 × 5–14 μm), yellow to yellowish brown in KOH. Stipe trama composed of 2–11 μm wide, cylindrical, thin-walled, yellow in KOH, parallel hyphae. Clamp connections absent in all tissues.
Habitat:—Gregarious on the ground in mixed forests of Castanopsis fissa (Champion ex Bentham) Rehder & E.H. Wilson and Pinus fenzeliana Hand. -Mzt.
Known distribution:—Southern China (Hainan Province).
Additional materials examined:— CHINA. Hainan Province: Yinggeling of Hainan Tropical Rainforest National Park, elev. 850 m, 7 May 2018, N. K. Zeng 3359 (FHMU2921).
description: Published as part of Li, Zhui, Zhang, Xu, Jiang, Shuai, Ji, You-Dong, Wang, Yi & Zeng, Nian-Kai, 2022, Tylopilus yangzhuliangii (Boletaceae, Boletales), a new bolete from tropical China, pp. 135-149 in Phytotaxa 543 (2) on pages 141-145, DOI: 10.11646/phytotaxa.543.2.4, http://zenodo.org/record/6450769