Mycena entolomoides T. Bau, 2018

Na, Qin & Bau, Tolgor, 2018, New species of Mycena (Mycenaceae, Agaricales) with colored lamellae and three new species records from China, Phytotaxa 361 (3), pp. 266-278 : 269-271

Mycena entolomoides T. Bau sp. nov. ( Fig. 1a, 1b , 2 )

MycoBank No. MB 823755

Diagnosis:—Surface of pileus glabrescent with translucent–striate, pruinose were seen occasionally in the center. The color of lamellae were incarnadine, surface and edges concolorous. Cheilocystidia transparent, fusiform to lageniform. Pleurocystidia obovoid, ventricose, apex often rounded or somewhat narrowed, with incarnadine contents. Pileipellis and stipitipellis covered with scattered excrescences, filled in incarnadine tones.

Etymology:—Possessing a pale pink lamellae similar to Entoloma species.

Type:— CHINA. Jilin Province: Changbai Mountain , Antu County, Yanbian Korean Autonomous Prefecture , N42°01′12″, E128°04′06″, 16 June 2016, Tolgor Bau and Qin Na, HMJAU 43048 (Holotype!) ; same location, 16 June 2016, Tolgor Bau and Qin Na, HMJAU 43052 (Isotype!) .

Description:—Pileus 1.5–2.8 mm diameter, conical, obtusely conical when young, paraboloid or campanulate with age, shallowly sulcate, translucent-striate, pruinose around umbo, but soon glabrescent, the margin infrequently out of flatness, carnation (8B4) at the centre and margin (8B3), chestnut brown (8C5), summer tan (8D6), deep clay (8E6) in the middle part, pallescent when drying. Context pale pink (8B2), thin. Lamellae adnate to slight adnex with a short tooth, light incarnadine (8A3–8A4), edges concolorous, with intervenose veins. Stipe 35–72 × 1.0– 1.5 mm, cylindrical, fragile, hollow, glabrous except for the granular apex, incarnadine (8B4) with faint olive tinge (6D4) in the apex, brownish (7E6–7E7) downward, fulvous below, base covered with white fibrils. Smell a bit nitrous in fresh specimens, disappeared quite quickly, tasted inconspicuous.

Basidiospores (7.0)7.8–9.7(11.4) × (3.6)4.5–5.6(6.2) μm, Q=1.5–2.1, ellipsoid to elongated–ellipsoid, hyaline, guttulate, thin walled, amyloid. Basidia 23–33 × 5–8 μm, 4 or 2 spored, clavate. Cheilocystidia (52)61–82(90) × 17–22 μm, abundant, fusiform to lageniform, apically generally passing into a narrow neck, but also with rounded apex, thin-walled and hyaline. Pleurocystidia numerous, 44–62 × 17–24 μm, fusiform, obovoid, ventricose, apex often rounded or somewhat narrowed, with incarnadine contents (7B6). Pileipellis a distinct cutis, composed by 2–5 μm wide hyphae, filled in incarnadine contents (7B5), smooth or sparely coating with simple, cylindrical excrescences, 2.8–5.2 × 1.0–2.0 μm. Hyphae of the stipitipellis 2–6 μm across, with incarnadine contents (7B5), smooth frequently, diverticulate with excrescences occasionally. Clamps present in all tissues.

Habitat:—Solitary or scattered, on humus ad fallen leaves in of pine and oak, common to the Pinus , Larix , Quercus mixed forests.

Known distribution:— Heilongjiang Province, Jilin Province, China

Additional Material examined:— CHINA. Heilongjiang Province: Fenglin National Nature Reserve, Yichun City, N48°11′14″, E129°22′31″, 14 July 2016, Qin Na, HMJAU 43126.

Figures

FIGURE 1. a) Mycena entolomoides (HMJAU 43048) b) M. entolomoides (HMJAU 43052) c, d) M. citrinomarginata (HMJAU 43563) e) M. purpureofusca (HMJAU 43554) f) M. purpureofusca (HMJAU 43624) g, h) M. strobilinoidea (HMJAU 43654). Bars: a-h=10 mm. Photos a–b by Yu-Guang Fan; Photos c–h by Qin Na

FIGURE 2. Mycena entolomoides (HMJAU 43048) a. Basidiomata; b. Basidia; c. Basidiospores; d. Pleurocystidia; e. Cheilocystidia; f. Pileipellis; g. Stipitipellis. Bars a=1 cm; b, c, d, e, f, g=10 μm Illustration by Qin Na