Mycena chlorocyanea L.N. Liu, 2022

Liu, Li-Na, Zhou, Guo-Ying, Tan, Zhu-Ming & Tian, Yong-Xiang, 2022, Two new Mycena (Mycenaceae, Agaricales) species with rhizomorphs from subtropical areas of China, Phytotaxa 576 (1), pp. 75-88 : 79-82

Mycena chlorocyanea L.N. Liu , sp. nov. 1 ( Figs. 2 , 3 )

MycoBank No.:—845537

Diagnosis:—This species is characterized by a green-blue pileus, decurrent lamellae, presence of white rhizomorphs, digitate cheilocystidia and hyphae of pileipellis an ixocutis. It differs from the most similar species M. cyanorrhiza by its decurrent lamellae and the presence of rhizomorphs.

Etymology:—refers to the green-blue colors of pileus.

Type:— CHINA. Hunan Province, Xiangxi Tujia-Miao Autonomous Prefecture , Yongshun County, Xiaoxi National Nature Reserve , 28°48′48″N, 110°15′20″E, elev. 531m, 20 April 2022, Lina Liu, HUIF 50234 (Holotype!) .

Description:— Pileus 3–8 mm diam, hemispheric to convex, becoming plano-convex to applanate, pale greenblue to dark green (25C3–25E6), sometimes with slightly depressed center, green-blue to dark green (25D3–25F6), silky when dry, slightly glutinous when wet, margins slightly crenulate, white to pale green-blue (25A1–25B3). Lamellae subdecurrent to deeply decurrent, subdistant (L=12–18, I=1–3), white (1A1), margins smooth, concolorous with faces. Stipe 1.9–5.2 cm, cylindrical, silky, glabrous or with many strigose hairs attaching to substratum, white to pale green-blue (25A1–25C4) towards apex, pale green-blue to green-blue-grey (25B3–25E4) towards base. Context thin. Rhizomorphs (criniform-like stipes) moderately abundant, filiform, not capitate, whitish (25A1). Smell and taste indistinctive.

Basidiospores 7.0–8.4 × 3.1–4.9 μm, Q=1.7–1.9, narrowly ellipsoid, smooth, hyaline, amyloid, thin-walled. Basidia 19–24 × 5–7 μm, short clavate, mostly 2-spored. Basidioles clavate. Lamellar edge sterile. Cheilocystidia 13–27 × 3–7 μm, clavate or cylindrical, sometimes irregular, with more than 4 cylindrical or clavate branches at apex, 2–7 × 1–2 μm, hyaline, colorless, inamyloid, thin-walled. Pleurocystidia absent. Pileus and lamellar trama composed of interwoven hyphae 2–10 mm diam, cylindrical or inflated at septa, hyaline, colorless, dextrinoid, thin-walled. Pileipellis an ixocutis of 1–5 μm wide, cylindrical hyphae, terminal cells cylindrical, sometimes with 2 to 4 irregular branches. Hyphae of the stipitipellis 2–7 μm diam, cylindrical, smooth, hyaline, colorless, inamyloid, thin-walled. Caulocystidia 12–27 × 2–6 μm, cylindrical, slightly clavate or irregular, often with septa, sometimes with 2 to 3 branches at apex, cylindrical or irregular, hyaline, colorless. Clamp connections present.

Habitat:—gregarious on leaves and twigs in broad-leaved forests mainly composed of Castanopsis eyrei (Champ.) Tutch. , Schima argentea Pritz. ex Diels and Lithocarpus petelotii A. Camus.

Known distribution:— Hunan Province, China.

Additional material examined:— CHINA. Hunan Province, Xiangxi Tujia-Miao Autonomous Prefecture, Yongshun County, Xiaoxi National Nature Reserve , 28°48′52″N, 110°15′17″ E, elev. 510 m, 21 April 2022, Lina Liu, HUIF 50238 .

Figures

FIGURE 2. Basidiomata of M. chlorocyanea. Photos by: Li-na Liu.

FIGURE 3. Morphological features of M. chlorocyanea. a. basidiomata; b. basidia; c. basidiospores; d. cheilocystidia; e. pileipellis; f. caulocystidia. Scale bars: a=5mm, c=5μm, b, e–f=10μm. Drawings by: Li-na Liu.