Cuphophyllus striatus C.Q. Wang, W.X. Xia & Ming Zhang, 2025

Xia, Wenxiao, Wang, Chaoqun, Li, Taihui, Deng, Wangqiu, Yue, Haimei & Zhang, Ming, 2025, Cuphophyllus striatus (Cuphophyllaceae, Agaricales), a new species from southwestern China, Phytotaxa 701 (2), pp. 207-215 : 210-211

Cuphophyllus striatus C.Q. Wang, W.X. Xia & Ming Zhang sp. nov. Figs. 2–4

Fungal Names : FN 571908

Etymology:—The specific epithet “striatus ” refers to the radially striate on the pileus.

Diagnosis:—Distinguished from C. lamarum by the combination of characteristics including the brownish orange to light brown and smaller pileus, white to light orange lamellae discolouring light brown to brown where bruised, and wider basidiospores.

Typification:— CHINA. Guizhou Province: Qiannan Buyi and Miao Autonomous Prefecture, Longli County, Longjiashan National Forest Park, elev. ca. 1210 m, at 26°27′54″N, 106°56′17″E, 5 July 2020, Ming Zhang (GDGM 80833, holotype! The GenBank accession numbers for the nucleotide sequences of the ITS, 28S, rpb 2 genes are PQ781251, PV570238, and PV578121, respectively).

Description:— Basidiomata small. Pileus 8–20 mm in diameter, plano-convex, applanate to slightly depressed when young, plano-concave to concave when maturity, orange white, pale orange, light orange (5A2–4), yellowish brown (5D4–8) to light brown (6D5–8) at mass, brownish orange to brown (7C4–6, 7D4– 8, 7E 4–8) at center when young, viscid when wet; margin straight to arched, even to wavy, with light orange (5A2–4) radial striae on the surface. Lamellae decurrent, distant, usually forked towards pileus margin, waxy, pale orange, orange white to white (5A1–4), even at edge, 1–1.5 mm wide, often with 3–4 unequal lamellulae between two entire lamellae, discolouring light brown to brown where injured. Stipe 10–40 × 1.3–6 mm, central, subcylindrical, usually curved, yellowish white to white (3A1–2), smooth, viscid when wet. Annulus absent. Taste and odor not recorded.

Basidiospores [40/2/2] 6.5–9(9.5) × (5.5)6–8(9.5) μm, L m = 7.70±0.65 µm, W m = 6.91±0.71 µm, Q = 1–1.33, Q m = 1.12±0.09, subglobose, rarely globose or broadly ellipsoid, smooth, thin-walled, hyaline in 5% KOH, usually containing olivaceous guttule, inamyloid. Basidia (39)41–53(60) × 7.5–10(10.5) μm, clavate, thin-walled, hyaline, 4-spored, with sterigmata 3.5–7.5 µm long. Basidioles 24–52 × 4.5–8 μm, numerous, clavate, at apex easily broken in 5% KOH. Cystidia absent. Lamellar trama subregular to interwoven, hyaline hyphae 2–11 µm wide. Pileipellis a cutis, composed of horizontal, subparallel or occasionally upturned, cylindrical hyphae, 3–10 μm wide, colorless, terminal elements 16–83 × 3–10 µm, hyaline. Stipitipellis a cutis, composed of parallel hyphae, occasionally upturned, hyaline, terminal elements 21–91 × 2.5–7 µm. Clamp connections present in all tissues.

Known distribution:—Currently only known from Guizhou Province of southwestern China.

Additional specimen examined:— CHINA. Guizhou Province: Qiannan Buyi and Miao Autonomous Prefecture, Longli County, Longjiashan National Forest Park, elev. ca. 1211 m, at 26°27′54″N, 106°56′17″E, 5 July 2020, Ming Zhang (GDGM 82013).

Figures

FIGURE 2. Morphological features of Cuphophyllus striatus A. Basidiomata (GDGM 82013), B, C. Basidiomata (GDGM 80833, holotype), D. Lamellae (GDGM 82013). Scale bars: 10 mm (A–C); 1 mm (D).

FIGURE 3. Line drawings of Cuphophyllus striatus (GDGM 80833) A Basidiospores B Basidia. Scale bars: 10 μm (A–B).

FIGURE 4. Light microscopy of Cuphophyllus striatus (GDGM 80833) A Basidiospores B Basidia C Pileipellis D Stipitipellis E Lamellar trama. Scale bars: 10 μm (A–D); 50 μm (E).