Minimelanolocus clavatus Y.L. Wan, D.F. Bao & H.Y. Su, 2021

Wan, Yi-Le, Bao, Dan-Feng, Luo, Zong-Long, Bhat, Darbhe-Jayarama, Xu, Yue-Xin, Su, Hong-Yan & Hao, Yu-E, 2021, Two new species of Minimelanolocus (Herpotrichiellaceae, Chaetothyriales) from submerged wood in Yunnan, China, Phytotaxa 480 (1), pp. 45-56 : 49

Minimelanolocus clavatus Y.L. Wan, D.F. Bao & H.Y. Su , sp. nov. ( Fig. 2 )

Index Fungorum number: IF557375, Facesoffungi number: FoF 07778

Etymology: —referring to the conidial morphology.

Holotype: — DLU 3022

Saprobic on submerged wood in freshwater habitats. Asexual morph: hyphomycetous. Colonies on substrate superficial, effuse, hairy, scattered, greyish brown to dark brown or black, glistening. Mycelium partly superficial and partly immersed, comprised of septate, dark brown hyphae. Conidiophores 150–230 × 7–9 μm (x = 190 × 8 μm, n = 5), mononematous, macronematous, erect, straight or slightly flexuous, uneven in width, septate. Conidiogenous cells polyblastic, denticulate, holoblastic, integrated, terminal, becoming intercalary, indeterminate, hyaline to pale brown. Conidia 31–41 × 5–7 μm (x = 36 × 6 μm, n = 24), 3–4-euseptate, pale brown, oblong, clavate to fusiform, straight or slightly curved. Sexual morph: Undetermined.

Material examined:— CHINA, Yunnan Province, Dali, Cangshan Mountain , Lingquanxi stream, 2571 m, 100.090989°E, 25.747501°N, on submerged decaying wood, 1 March 2019, Z.Q. Zhang, S-3022, ( DLU 3022 , holotype); ex-type culture, DLUCC 3022 .

Notes: —In the phylogenetic analysis, Minimelanolocus clavatus clustered within Minimelanolocus sensu lato. In morphology, M. clavatus is similar to M. aquaticus H.Y. Su, Udayanga & K.D. Hyde and M. asiaticus H.Y. Su, Udayanga & K.D. Hyde in having mononematous, macronematous, straight or slightly flexuous, septate conidiophores and multiseptate conidia when immature. However, M. clavatus differs from M. asiaticus in having fewer septa (3–4 vs. 3–6) and longer conidia (31–41 μm vs. 13–32 μm). Minimelanolocus clavatus is distinguished from M. aquaticus by the size and number of septa. Conidia of M. aquaticus are shorter (27–43 μm vs. 31–41 μm) and have more septa (3–6 vs. 3–4) than those of M. clavatus ( Liu et al. 2015) .

Figures

FIGURE 2.Minimelanolocus clavatus (DLU3022,holotype). a.Appearance of the fungus on wood.b, c. Conidiophores.d.Conidiophore with developing conidium. e–h. Conidiogenous cells. i–v. Conidia. w. Germinated conidium. x, y. Colonies on PDA (x. above view, y. reverse). Scale bars: b–d = 40 μm, e–h = 25 μm, i–v = 15 μm, w = 25μm.