Tylopilus callainus N.K. Zeng, Zhi Q. Liang & M.S. Su, 2018
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publication ID |
https://doi.org/ 10.11646/phytotaxa.343.3.7 |
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persistent identifier |
https://treatment.plazi.org/id/03EBB505-6639-8135-FF16-D15AFCC9313B |
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treatment provided by |
Felipe |
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scientific name |
Tylopilus callainus N.K. Zeng, Zhi Q. Liang & M.S. Su |
| status |
sp. nov. |
Tylopilus callainus N.K. Zeng, Zhi Q. Liang & M.S. Su View in CoL , sp. nov. ( Figs. 2–3 View FIGURE 2 View FIGURE 3 )
MycoBank: MB 823438
Etymology: — Latin “ callainus ” meaning sea-green, referring to the species having a sea-green color change of hymenophore and context when injured.
Diagnosis:—Differing from other species in Tylopilus s. str. by a brown pileus tinged with sea-green, a sea-green color change of hymenophore and context when injured, a stipe with sea-green color on the upper part, and a trichodermal pileipellis with slightly inflated hyphae. Also distinctive by the combined molecules 28S + ITS + TEF1.
Holotype:— CHINA. Fujian Province: Zhangping County, XinqiaoTown, Chengkou Village , elev. 350 m, 22 August 2013, N.K. Zeng 1459 ( FHMU).
Description:— Basidiomata small to medium-sized. Pileus 2.5–5.5 cm in diameter, convex, plano-convex to plane; surface dry, densely tomentose, then squamulose, pale yellowish brown (6A3–5), yellowish brown (6B5–6) to brown (6C5–6), tinged with sea-green (25B5–7); context about 0.6–0.9 cm in thickness in the center of the pileus, yellowish white (1B1–2), changing sea-green (25B6) slowly when injured. Hymenophore poroid, adnate or slightly depressed around apex of stipe; pores angular, 0.5–1.5 mm in diameter, yellowish white (2B2) when young, then yellow (2B4–5), changing sea-green (25B6) slowly when injured; tubes about 0.2–0.3 cm in length, yellowish white (1B2) when young, then yellowish (2B3), changing sea-green (25B6) slowly when injured. Stipe 2.5–5.5 × 0.6–0.8 cm, central, subcylindric, solid, usually flexuous; surface dry, upper part sea-green (25B6) but yellowish (2A2) at apex, middle and lower part pale brown (5B4–5), brown (6B4–5) to dark brown (7C4–5); context yellowish white (1B1–2) on the upper part, changing sea-green (25B6) slowly when injured, pale brown (6C4–5) on the lower part, unchanging in color when injured; basal mycelium white (1A1). Spore print pinkish. Odor indistinct. Taste bitter.
Basidia 22–36 × 8–10 μm, clavate, thin- to slightly thick-walled (up to 0.5 μm), 4-spored, colorless in KOH; sterigmata 3–5 μm in length. Basidiospores [162/8/6] (7–)7.5–9(–10) × 4–5 μm, Q=(1.56–)1.60–2.00(–2.25), Q m =1.82 ± 0.17, ellipsoid to subfusiform, slightly thick-walled (up to 0.5 μm), olive brown to yellowish brown in KOH, smooth. Hymenophoral trama bilateral, composed of colorless in KOH, 3–9 μm wide, thin- to slightly thick-walled (up to 0.5 μm) hyphae. Cheilocystidia 23–35 × 6–9 μm, not abundant, ventricose, fusiform or subfusiform, thin- to slightly thick-walled (up to 0.5 μm), colorless in KOH, no encrustations. Pleurocystidia 26–42 × 6–10 μm, not abundant, ventricose, fusiform or subfusiform, thin- to slightly thick-walled (up to 0.5 μm), colorless in KOH, no encrustations. Pileipellis a trichoderm about 140 μm thick, composed of more or less vertically arranged, colorless, pale yellowish brown to brown in KOH, 6–14 μm wide, thin- to slightly thick-walled (up to 1 μm) hyphae; terminal cells 29–50 × 10–13 μm, clavate or subclavate, with actue (sometimes obtuse) apex. Pileal trama made up of hyphae 6–10 μm in diameter, thinto slightly thick-walled (up to 1 μm), colorless in KOH. Stipitipellis a trichoderm-like structure about 50 μm thick, composed of thin- to slightly thick-walled (up to 0.5 μm), colorless, pale yellowish brown to yellowish brown in KOH, emergent hyphae with ventricose, clavate, subclavate, fusiform or subfusiform terminal cells (16–25 × 5–8 μm), and occasionally with clavate, 4-spored basidia (13–18 × 4–6 μm). Stipe trama composed of 4–7 μm wide, cylindrical, thin to slightly thick-walled (up to 0.5 μm), colorless in KOH, parallel hyphae. Clamp connections absent in all tissues.
Habitat: — Solitary or gregarious on the ground in forests dominated by fagaceous plants.
Known distribution: — The south of China (Fujian and Hainan Province), Japan.
Additional materials examined:— CHINA. Fujian Province: Zhangping County, XinqiaoTown, Chengkou Village , elev. 350 m, 22 August 2013, N.K. Zeng 1360 ( FHMU) ; same location, 23 August 2013, N.K. Zeng 1460 ( FHMU) ; same location, 24 August 2013, N.K. Zeng 1464 ( FHMU). Hainan Province: Baisha County, Yinggeling National Nature Reserve , elev. 550 m, 1 August 2015, N.K. Zeng 2436 ( FHMU) ; same location, 26 May 2017, N.K. Zeng 2982 ( FHMU) ; same location, 27 May 2017, N.K. Zeng 3001 ( FHMU) .
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