Mycena flosoides 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 : 82-83

Mycena flosoides L.N. Liu , sp. nov. 2 ( Figs. 4 , 5 )

MycoBank No.:—845538

Diagnosis:—This species is characterized by a pink conical pileus, horizontal to decurrent lamellae, stipe tapering downwards, presence of brown rhizomorphs, hyphae of cheilocystidia with excrescences, hyphae of pileipellis and stipitipellis with excrescences. It differs from the most similar species M. tubarioides by the horizontal to decurrent lamellae, tapering stipe, and presence of brown rhizomorphs.

Etymology:—refers to the lovely basidiomata which look like flowers.

Type:— CHINA. Guangxi Zhuang Autonomous Region , Baise City , Leye County, Yachang Orchid National Nature Reserve , 24°46ˊ28”N, 106°20ˊ08”, elev. 1075 m, 30 June 2021, Lina Liu, HUIF 50128 (Holotype!) .

Description:— Pileus 1–3 mm diam, conical with flat top to obtusely conical, sometimes expanding with age, sometimes with slightly depressed center, sulcate, translucent-striate, glabrous, pink (9A2–9A3), pale pinkish purple to russet-red (9A4–9C5) with pale russet-red to russet-red striae (9B4–9C6), sometimes with slightly depressed center, margins slightly crenulate, pale pink to white (9A3–9A1). Lamellae horizontal to decurrent, subdistant (L=10–16, I=1–2), broader than the length, margin even, pink to pale pinkish purple (9A3–9A2), margins smooth, concolorous with faces. Stipe 2–9 mm, cylindrical, but tapering downwards, glabrous, pink or pale pinkish purple (9A3–9A2) at apex, reddish brown (9B3–9F5) further down, glabrous. Rhizomorphs moderately abundant, clavate, not capitate, reddish brown to blackish brown (9E7–9F5). context of the pileus thin. Smell and taste indistinctive.

Basidiospores 5.3–6.8 × 3.0–3.8 μm, Q=1.7–1.8, narrowly ellipsoid, smooth, hyaline, amyloid, thin-walled. Basidia 12–18 × 5–7 μm, short clavate, 4-spored. Basidioles clavate. Lamellar edge sterile. Cheilocystidia 18–26 × 7–14 μm, cylindrical, clavate to broadly clavate, with simple to furcate or branched, straight to curved, cylindrical excrescences, 2–5 × 0.5–2 μm, hyaline, colorless, inamyloid, thin-walled. Pleurocystidia absent. Pileus and lamellar trama composed of interwoven hyphae 2–12 mm diam, cylindrical or inflated at septa, hyaline, colorless, dextrinoid, thin-walled. Pileipellis a cutis of 2–5 μm wide, cylindrical hyphae, densely covered with warts and cylindrical excrescences; terminal cells up to 42 × 16 μm. Hyphae of the stipitipellis 2–4 μm diam, cylindrical, with excrescences 1–4 × 1–2 μm, hyaline, colorless, inamyloid, thin-walled. Clamp connections present.

Habitat:—gregarious on needles of Pinus yunnanensis Franch. var. tenuifolia Cheng et Law.

Known distribution:— Guangxi Zhuang Autonomous Region, China.

Additional material examined: CHINA. Guangxi Zhuang Autonomous Region, Baise city, Leye County, Yachang Orchid National Nature Reserve , 28°43′27″N, 110°11′25″ E, 30 June 2021, Lina Liu, HUIF 50129 .

Figures

FIGURE 4. Basidiomata of M. flosoides. Photos by: Li-na Liu.

FIGURE 5. Morphological features of M. flosoides. a. basidiomata; b. basidia; c. basidiospores; d. cheilocystidia; e. pileipellis; f. hyphae of the stipitipellis. Scale bars: a=1mm, c=5μm, b, e–f=10μm. Drawings by: Li-na Liu.