Neohygrocybe griseonigra C.Q. Wang & T.H. Li, 2018

Wang, Chao-Qun, Zhang, Ming & Li, Tai-Hui, 2018, Neohygrocybe griseonigra (Hygrophoraceae, Agaricales), a new species from subtropical China, Phytotaxa 350 (1), pp. 64-70 : 66-67

Neohygrocybe griseonigra C.Q. Wang & T.H. Li sp. nov. Figs. 2–3

Fungal Name: FN570542

Etymology:— griso- = gray, -nigra = black, referring to the gray to black pileus and stipe color.

Diagnosis:—differs from all known Neohygrocybe species by its brownish gray to grayish yellow pileus, radially fibrillose-squamulose dry pileus surface, whitish to grayish white lamellae changing to red and then black when bruised, grayish brown to blackish stipe, ellipsoid to globose spores (7–9 × 4.5–6.5 μm), and lanceolate pseudocystidia.

Type:— CHINA. Guangdong Province, Shaoguan City, Shixing County, Chebaling National Natural Reserve, at 24°43′ N, 114°13′ E, elev. 450 m, 21 June 2014, Ming Zhang (holotype, GDGM44492!).

Description:— Basidiomata agaricoid and stipitate, small to medium sized. Pileus 30–35 mm broad, hemispherical to convex, with a central umbo about a quarter of pileus diameter but depressed and often perforated in the very center when mature, finely striate radially and rugulose, dry, fibrillose-squamulose, opaque, slightly transparent at margin, brownish gray to grayish brown (6E2–3), olive brown (4F3–8), grayish yellow (2B3–4), with a lighter colored to yellowish margin which is usually tending to rimose or lacerated when mature. Lamellae adnate, adnexed or sinuate, up to 7 mm wide, with 24–32 complete lamellae per pileus, ventricose, hygrophanous, waxy, fragile, whitish to grayish white (1A1, 1B1), darker at upper portion and paler at edge at first, discoloring to greyish red (7B3–4) and then to dark brown (6F8) when bruised, becoming more dingy color in age, with 1–4 lamellulae but only one larger lamellula between two complete lamellae; margin usually even and concolorous or lighter than the faces, but easily damaged becoming uneven and discolored. Stipe 30–50 × 3–6 mm, central to slightly eccentric, cylindrical to subcylindrical, curved, grayish brown (5F3–4), dark gray or blackish (5F1–2), hygrophanous, longitudinally striate. Taste and odor indistinct.

Basidiospores 7–9 × 4.5–6.5 μm, Q = 1–1.6, Qm = 1.3–1.4, ellipsoid to globose, smooth, hyaline, non-amyloid. Basidia 35–42 × 5–7.5 μm, 2 or 4-spored, mainly 4-spored, with sterigmata up to 11.5 μm long. Hymenophoral trama subregular, composed of cylindrical hyphae 22–116 × 4–13.5 μm. Pseudocystidia (probably protruding ends of trama cells) projecting 60–90 μm above the facial basidia, lanceolate, scattered. Pileipellis a cutis, in some places approaching a trichoderm, composed of repent, or clusters of sub-erect hyphae up to 15 μm wide with brown intracellular plasmatic pigment. Clamp connections abundant.

Habit, habitat and distribution:—solitary or scattered on soil on the roadside slope of a broad-leaved forest with mosses in subtropical China, so far only known from the type location.

Figures

FIGURE 2. Basidiomata of Neohygrocybe griseonigra. a: Habitat and appearance overview. b: Pileus margin. c: Detailed pileus surface. d: Lamellae. Bars = 2 cm. Photos by: Ming Zhang.

FIGURE3.Line drawingsofNeohygrocyebgriseonigra. a:Basidiomata.b:Basidiospores.c:Basidia.d:Pseudocystidia. Drawings by a) By Ya-Heng Shen, b–d) Chao-Qun Wang.