Baorangia duplicatopora N.K. Zeng, Xu Zhang & S. Jiang, 2021

Zhang, Xu, Liang, Zhi-Qun, Jiang, Shuai, Xu, Chang, Fu, Xin-Hua & Zeng, Nian-Kai, 2021, Baorangia duplicatopora (Boletaceae, Boletales), a new bolete from tropical China, Phytotaxa 508 (1), pp. 49-58 : 53-55

Baorangia duplicatopora N.K. Zeng, Xu Zhang & S. Jiang , sp. nov. ( Figs 2–3 )

MycoBank: MB838495

Etymology:—Latin “ duplicatopora ”, refers to the species having compound pores.

Diagnosis:—Characterized by a large to very large basidioma with a dull rose red, rose pink to purplish red pileus, compound pores, context near hymenophore in pileus and context in stipe staining blue when injured, a red stipe, and cheilocystidia wider than those of other Baorangia species.

Holotype:— CHINA, Hainan Province: Baisha County, Yinggeling of Hainan Tropical Rainforest National Park , N19°1ʹ57′′, E109°25ʹ23′′, elev. 698 m, 5 July 2020, N. K. Zeng4506 ( FHMU5877 ). GenBank accession numbers: 28 S = MW 473483 , ITS = MW 473489 , TEF1 = MW 485968 .

Description:— Basidiomata large to very large. Pileus 15–17 cm diam, subhemispherical at first, then convex to applanate; margin decurved, sometimes slightly uplifted when old; surface dry, dull rose red (11B4), rose pink (11B3) to purplish red (11C6); context 3–3.3 cm thick at mid-radius of the pileus, yellowish white (2A6), mostly unchanging in color when injured, but turning bluish near hymenophore. Hymenophore thin, slightly decurrent; pores angular, compound, yellow to yellowish brown (2A5), turning blue when injured; tubes 0.4–0.8 cm in length, pale yellow (2A6), turning blue when injured. Stipe 6–7 × 2–4.5 cm, subcylindrical, solid; surface densely covered with red to dark red (11C6) dots, sometimes with reticulations at apex of the stipe; context yellowish (2A6), turning blue quickly when injured; annulus absent. Basal mycelium white (8A1). Odor not distinctive.

Basidia 26–37.5 × 8–12.5 μm, clavate, thin-walled, 4–spored, hyaline or yellowish in KOH, light yellow to yellowish brown in Melzer’s reagent; sterigmata 3–4 μm in length. Basidiospores 7.5–11.5 (–12.5) × 3.5–5 μm, Q = (1.67–) 1.78–2.71(–2.88), Qm = 2.24 ± 0.27, subfusoid to elliptical and inequilateral in side-view with slightly suprahilar depression, subfusoid in ventral view, slightly thick-walled (<1 μm thick), yellowish brown in KOH, yellow to yellowish brown in Melzer’s reagent, smooth. Cheilocystidia 39.5–63.5 × 16.5–23 μm, abundant, subfusiform, ventricose, thin-walled, yellowish brown in KOH, light yellow to yellowish brown in Melzer’s reagent. Pleurocystidia 27–57 × 6.5–12.5 μm, subfusiform, ventricose, thin-walled, yellowish brown in KOH, light yellow to yellowish brown in Melzer’s reagent. Hymenophoral trama bilateral, made up of hyphae 4–10 μm in wide, thin-walled, colorless in KOH. Pileipellis an interwoven trichoderm 200–470 μm thick, composed of hyphae brown to yellowish brown in KOH, yellowish brown in Melzer’s reagent, 4–7 (–11) μm wide; terminal cells 45–139 × 3.5–7 μm, subcylindrical, with subacute apex. Pileal trama composed of interwoven hyphae 3.5–9 μm wide, thin-walled. Stipitipellis trichodermiallike 50–150 μm thick, composed of slightly thick-walled (up to 1 μm thick), emergent hyphae, semitransparent to yellowish brown in KOH, yellowish brown in Melzer’s reagent, 2.5–6 μm wide, with clavate or subclavate terminal cells (20–45.5 × 4.5–12 μm). Stipe trama composed of parallel hyphae 4–10 μm wide, thin- to slightly thick-walled (up to 0.5 μm), colorless in KOH. Clamp connections not seen in any tissue.

Habitat: — Solitary to scattered on the ground in forests dominated by Lithocarpus silvicolarum (Hance) Chun.

Known distribution:—Southern China.

Additional specimens examined:— CHINA. Hainan Province: Baisha County, Yinggeling of Hainan Tropical Rainforest National Park , N19°1ʹ57′′, E109°25ʹ23′′, elev. 698 m, 5 July 2020, N. K . Zeng4507, 4511 ( FHMU5878 , 5879 ); same location and date, WCQ001 ( FHMU5880 ) .

Figures

FIGURE 2. Basidiomata of Baorangia duplicatopora. (a, c–d from FHMU5877, holotype; b from FHMU5879). Photos by N.K. Zeng.

FIGURE 3. Microscopic features of Baorangia duplicatopora (FHMU5877, holotype). a. Basidia. b. Basidiospores. c. Cheilocystidia. d. Pleurocystidia. e. Pileipellis. f. Stipitipellis. Bars = 20 μm. Drawings by X. Zhang.