Minimelanolocus nujiangensis Y.L. Wan, Z.L. Luo & 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 : 50-51

Minimelanolocus nujiangensis Y.L. Wan, Z.L. Luo & H.Y. Su , sp. nov. ( Fig. 3 )

Index Fungorum number: IF557377, Facesoffungi number: FoF07779

Etymology: —referring to the collecting location, Nujiang River.

Holotype: — DLU 962

Saprobic on submerged wood in freshwater ecosystem. Asexual morph: hyphomycetous. Colonies on woody substrate superficial. Mycelium effuse, partly superficial and partly immersed, dark brown, smooth. Conidiophores 170–280 × 5–7 μm (x = 225 × 6 μm, n = 6), mononematous, macronematous, erect, simple, smooth, cylindrical, slightly flexuous, unbranched, dark brown, paler towards apex, septate. Conidiogenous cells denticulate, holoblastic, polyblastic, hyaline to subhyaline, flexuous, integrated, sympodial. Conidia 41–49 × 6–8 μm (x = 45 × 7 μm, n = 22), acropleurogenous, 6–7-septate, with faint septation in immature conidia, not constricted at septa, pale brown, straight or slightly flexuous, clavate to fusiform or oblong, tapering towards both ends. Sexual morph: Undetermined.

Material examined:— CHINA, Yunnan Province, Nujiang River , 1130m, 26.571820°E, 98.501549°N, saprobic on submerged decaying wood, 27 October 2016, S.M. Tang, S-962, ( DLU 962 , holotype); ex-type culture, DLUCC 962 .

Notes: —In the phylogenetic analysis, Minimelanolocus nujiangensis clustered with M. melanicus H.Y. Su, Udayanga & K.D. Hyde with high bootstrap support (95 MLBS /0.97PP, Fig. 1 ). However, M. nujiangensis differs from M. melanicus in having longer conidiophores (170–280 μm vs. 137–167 μm) and larger conidia (41–49 × 6–8 μm vs. 9–45 × 2.5–8 μm). Conidiophores of M. melanicus have a melanized base ( Liu et al. 2015, Tian et al. 2016).

Figures

FIGURE 1. Phylogenetic tree based on RAxML analyses of a combined ITS, LSU and SSU dataset. Bootstrap support values for maximum likelihood (MLBS) higher than 75% and Bayesian posterior probabilities (PP) greater than 0.95 are indicated above the nodes as MLBS/PP. The tree is rooted to Cyphellophora sessilis (CBS 243.85) and C. oxyspora (CBS 698.73). Ex-type strains are in bold and newly generated sequences are in red.

FIGURE 3. Minimelanolocus nujiangensis (DLU 962, holotype). a. Conidiophore. b. Conidiophore with conidia. c, d. Conidiogenous cells. e–l. Conidia. m. Germinated conidium. n, o. Colonies on PDA (n. above view, o. reverse). Scale bars: a = 35 μm, b = 80 μm, c–l = 15 μm, m = 25 μm.