Ripartites subtropicus Z.M. He & Y.Z. Yang, 2025
|
publication ID |
https://doi.org/10.11646/phytotaxa.705.1.4 |
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persistent identifier |
https://treatment.plazi.org/id/03997179-FFC5-FF9E-C7DB-FB23FDD3291F |
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treatment provided by |
Felipe |
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scientific name |
Ripartites subtropicus Z.M. He & Y.Z. Yang |
| status |
sp. nov. |
Ripartites subtropicus Z.M. He & Y.Z. Yang , sp. nov. ( Figs. 2–4 View FIGURE 2 View FIGURE 3 View FIGURE 4 )
MycoBank: MB857719
Etymology:— ‘ subtropicus ’ (Latin), referring to the subtropical habitat.
Diagnosis:—This species has a white to light brown depressed pileus with finely pubescent margin, cream decurrent lamellae, a yellow-brown stipe with basal rhizoids, and verrucose basidiospores. Similar to R. tricholoma , but differs by its nearly naked to indistinct pubescent pileus margin, the concurrent presence of mono-, bi- and tetrasporic basidia, and its subtropical habitat.
Type:— CHINA. Guizhou Province: Shuicheng County, Shuicheng National Rhododendron Garden , on humus covered with needle litter of Pinus armandii Franch. , alt. 1982 m, at 26°47'34.82''N, 104°49'4.63''E, 17 June 2023, Z.M. He 1, MHHNU 20001 (holotype!).
Description:— Fruitbody small-sized, omphalioid. Pileus 10–30 mm in diam, applanate to slightly depressed with an unconspicuous papilla at center, hygrophanous; surface white (1A1) when dry, light brown (3A2–3) when wet, yellowish brown (5A2–4) at center, smooth, not gelatinized; margin inflexed to involute when young, straight when old, finely white (1A1) pubescent at very margin, not striate; context thin (1–2 mm thick), white (1A1). Lamellae decurrent, subcrowded, sometimes furcate near stipe apex, arcuate, cream (1A2), narrow (1–2 mm high); edges even. Stipe 14–35 × 2–3 mm, central or somewhat eccentric, solid, equal, often flexuous; surface wet, yellow-brown (3B4– 6), finely white-fibrillose longitudinally; base not inflated, with white (1A1) rhizomorphs; context white (1A1). Odor fungoid and pleasant. Chemical spot test: surface of dried pileus and stipe produces a negative reaction to 30% KOH.
Basidiospores [100/3/3] (4–)4.5–5.5 × 4–5 μm, Q = (1.02–)1.04–1.23(–1.28), Qm = 1.13 ± 0.06, pale brown, subglobose to broadly ellipsoid, with verrucae 0.4–0.6 × 0.3–0.4 μm, thin-walled, inamyloid. Basidia 20–27 × 6–9 μm, clavate, hyaline, thin-walled, 1-, 2- or 4-spored; sterigmata up to 9 μm long. Pleurocystidia and cheilocystidia absent. Lamellar trama subregular, composed of thin-walled, cylindrical, non-branched hyphae 4–10 µm wide. Pileipellis a cutis, composed of parallel to slightly interwoven, thin-walled, cylindrical hyphae 3–6 μm wide, with clusters of filamentous hyphae at margin. Stipitipellis a cutis, composed of parallel, thin-walled hyphae 4–8 μm wide. Clamp connections present in all tissues.
Ecology:—Solitary, on humus, in subtropical montane forests; summer.
Distribution:—Only known from Southwestern and Central China.
Additional specimens examined:— CHINA. Hubei Province: Qingchuan County, southern district of Shennongjia Forestry, on humus covered with oak leaf litter, alt. 1800 m, at 31°24'54.14''N, 110°29'58.53''E, 16 July 2012, J. Qin 555, KUN-HKAS 77956. Guizhou Province: Leishan County, Leigong Mountain National Forest Park, on humus covered with leaf litter of Pinus fenzeliana Hand.-Mazz and Fagus sp. , alt. 1730 m, at 26°22'36.81''N, 108°11'58.19''E, 21 June 2023, Z.M. He 17, MHHNU 20017.
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