Mycena brunnescens Zhang & Xiao & Tan & Shen & Shen & Tan & Li & Feng & Liu & Liu 2024, sp. nov.
Creators: name: Zhang, Hong
name: Xiao, Ying Xin
name: Tan, Zhu Ming
name: Shen, Ai Rong
name: Shen, Bao Ming
name: Tan, Yun
name: Li, Sai Nan
name: Feng, Li Guo
name: Liu, Zhu Xiang
name: Liu, Li Na
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Agaricales
Mycenaceae
Mycena
Mycena brunnescens

description: Mycena brunnescens L. N. Liu sp. nov.
Materials
Type status: Holotype. Occurrence: occurrenceID: 2723CE40-21C3-5048-93D7-89379C9BF8F0; Taxon: kingdom: Fungi; phylum: Basidiomycota; class: Agaricomycetes; order: Agaricales; family: Mycenaceae; genus: Mycena; taxonRank: species; Location: country: China; stateProvince: Guangxi; county: Leye; verbatimLocality: Yachang Orchid National Nature Reserve; verbatimLatitude: 24 ◦ 29 ′ 04.62 ″ N; verbatimLongitude: 106 ◦ 22 ′ 35.40 ″ E; Identification: identifiedBy: Ying Xin Xiao; Event: eventDate: 30 June 2021; Record Level: institutionID: JIU; collectionID: JIU 125
Type status: Paratype. Occurrence: occurrenceID: 10688CAA-8D2B-56EE-86AD-CF320C05CC3E; Taxon: kingdom: Fungi; phylum: Basidiomycota; class: Agaricomycetes; order: Agaricales; family: Mycenaceae; genus: Mycena; taxonRank: species; Location: country: China; stateProvince: Guangxi Zhuang Autonomous Region and Sichuan Province; county: Leye; verbatimLocality: Yachang Orchid National Nature Reserve; verbatimLatitude: 27 ° 23 ′ 40 ′′ N; verbatimLongitude: 106 ° 11 ′ 35 ′′ E; Identification: identifiedBy: Ying Xin Xiao; Event: eventDate: 30 June 2021; Record Level: institutionID: JIU; collectionID: JIU 126
Type status: Paratype. Occurrence: occurrenceID: 611F3C05-18F0-5409-A51F-6496001496C9; Taxon: kingdom: Fungi; phylum: Basidiomycota; class: Agaricomycetes; order: Agaricales; family: Mycenaceae; genus: Mycena; taxonRank: species; Location: country: China; stateProvince: Sichuan province; Identification: identifiedBy: Ying Xin Xiao; Event: eventDate: 30 September 2023; Record Level: institutionID: JIU; collectionID: JIU 127
Description
Pileus 3–8 mm diam., hemispherical, plane-convex to nearly applanate, umbonate to deppresed to almost subumbilicate, first translucent-striate, then sulcate, glabrous, light orange (6 A 5) to orange (6 B 7) when young, becoming yellowish-brown (6 F 6) or dark brownish-grey (6 F 8) in the disc and in the grooves with age, margin concolorous or paler, pale yellowish-brown (5 D 8) to brown (6 D 7) or dark brown (6 F 4–6 F 8). Context thin, fragile, whitish. Lamellae decurrent, moderately distant (L = 15–20, I = 1–2), changing from whitish (1 A 1) to dark brown (6 F 7–6 F 8) when bruised, lamellae edges light orange to orange (6 A 5-6 B 7), light brown (6 D 4–6 D 8) to brown (6 E 8). Stipe 17–34 × 1–2 mm, cylindrical, hollow, surface smooth, yellowish-red (8 B 6) to reddish-brown (8 D 6) towards apex when young, becoming yellowish-brown (6 F 6–6 F 8) in age, the upper portion brownish-orange (6 C 6), light brown (6 D 4–6 D 8) or brown (6 E 4–6 E 8), equal and with a slightly bulbous base, covered with whitish fibrils (Fig. 1). Odour and taste not distinctive.
Basidiospores 5.9–7.3 (7.5) × (3.1) 3.2–3.8 μm, Q = 1.6–2.2, ellipsoid to oblong, few subcylindrical, smooth, hyaline, amyloid, thin-walled. Basidia 14–23 × 5–10 μm, short clavate or clavate, 4 – spored, thin walled. Cheilocystidia 20–42 × 6–12 μm, clavate or cylindrical, with branches excrescences at the apex, 3–10 × 1–3 μm, with yellowish- brown (5 D 8) contents. Pleurocystidia absent. Pileipellis a cutis, hyphae of the pileipellis 1.6–4 μm wide, hyaline, densely covered with cylindrical excrescences, 1–4 × 1–2 μm. Hyphae of the stipitipellis 1–7 μm wide, with cylindrical excrescences 1–4 × 1–2 μm, hyaline, thin-walled. Clamps present in all tissues (Fig. 2).
Diagnosis
Mycena brunnescens has a brown pileus, lamellae that change from whitish to brown when bruised, orange to brown lamellae edges, basidiospores ellipsoid to oblong, cheilocystidia clavate with yellowish-brown contents, pileipellis and stipitipellis covered with cylindrical excrescences. Differs from M. strobilinoidea by branched cheilocystidia and absent pleurocystidia.
Etymology
Referring to the colour of basidiomata.
Distribution
Only known from Guangxi Zhuang Autonomous Region and Sichuan Province.
Ecology
Scattered or gregarious on decayed leaves.
description: Published as part of Zhang, Hong, Xiao, Ying Xin, Tan, Zhu Ming, Shen, Ai Rong, Shen, Bao Ming, Tan, Yun, Li, Sai Nan, Feng, Li Guo, Liu, Zhu Xiang & Liu, Li Na, 2024, Mycena brunnescens (Basidiomycota, Mycenaceae), a new species of Mycena sect. Pterigenae from China, pp. e 125570 in Biodiversity Data Journal 12 on page e125570, DOI: 10.3897/BDJ.12.e125570