Mycena purpureofusca (Peck 1885: 85) Sacc. (1887: 255)

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 : 273-274

Mycena purpureofusca (Peck 1885: 85) Sacc. (1887: 255) ( Fig. 1e, 1f , 4 )

≡ Agaricus purpureofuscus Peck (1885: 85)

Description:—Pileus 6–32 mm in diameter, conical to campanulate, with obtuse umbonate in young stages, sulcate, translucent-striate, glabrous, dull violet (11E3–11E4), dark purple (11E5–11E6), with fuscous tinge in the centre (6F7– 6F8), and margin with lilac shade. Context thin but cartilaginous, purplish-gray (12D2) becoming pallid (12C1) to cream white (12B1). Lamellae adnate to adnex, with a short tooth, interveined indistinctly, whitish to grayish (6A1– 6B1), edge deep violet distinctly (8F8). Stipe 35–85 × 1.5–2.5 mm, cylindric, fragile, hollow, pruinose to glabrescent towards the base, violet-brown (10E3), base usually somewhat darker brown (8E6) and covered with white fibrils. Odor and taste indistinct or slight raphanoid.

Basidiospores (6.9)9.2–11.8 × (5.7)6.5–7.9 μm, Q=1.2–1.5, broadly elliptic, colorless but abundant drops, smooth, thin walled, amyloid. Basidia clavate, 25–34 × 8–11 μm, contents transparent, with 4 sterigmata, colorless but abundant drops, septa without clamps. Cheilocystidia33–57× 9–25μm, abundant and variably shaped, clavate, fusiform, utriform, or apically broadly rounded, with violet-brown (8F8) contents, forming a deeper clumpy pigment, unclamped at the base. Pleurocystidia absent. Hyphae of the pileipellis 2–7 μm across, with irregular warts or outgrowths, cylindrical excrescences, 2.4–12.7 × 1.5–3.9 μm, lilac-brown (7F8) colored, thin walled, clamp connections absent. Stipitipellis consist of 2–5 μm wide, filled in light pale violet (9E4) contents, sparsely diverticulate, 1.5–1.9 × 0.9–1.5 μm. Clamps generally absent or very rare.

Habitat:—Solitary or scattered, in coniferous forests, litter layer of Pinus or Larix .

Known distribution:— China, Asia ( Aravindakshan 2015), Europe ( Robich 2003, Aronsen & Laessøe 2016), North America ( Smith 1947; Perry 2002).

Material examined:— CHINA. Inner Mongolia Autonomous Region: Yikesama National Forest Park , Mangui Town , Hulunbeier City , N51°57′18″, E122°02′26″, 30 July 2017, Na Qin, HMJAU 43624 ; South Mountain, Mangui Town, Hulunbeier City , N49°15′19″, E124°14′48″, 31 July 2017, Na Qin, HMJAU 43635, HMJAU 43640 ; Jilin Province: Changbai Mountain, Antu County, Yanbian Korean Autonomous Prefecture , N42°28′13″, E128°10′10″, 30 June 2017, Na Qin, HMJAU 43554 .

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 4. Mycena purpureofusca (HMJAU 43554) a. Basidiomata; b. Basidiospores; c.; Basidia d. Pileipellis; e. Stipitipellis; f. Cheilocystidia. Bars a=2 cm; b, c, d, e, f=10 μm Illustration by Qin Na