Arthrobotrys jindingensis X. Zhang & X. Y. Yang, 2022

Zhang, Xin, Zhang, Fa, Jiang, Lin, Yang, Yao-Quan, Yang, Xiao-Yan & Xiao, Wen, 2022, Two new nematode-trapping fungi (Arthrobotrys, Orbiliaceae) from Yunnan, China, Phytotaxa 568 (3), pp. 255-266 : 260-262

Arthrobotrys jindingensis X. Zhang & X. Y. Yang , sp. nov. ( FIGURE 2 )

Index Fungorum number: IF559863

Etymology: —The species name “jindingensis” refers to the name of the sample collection site: Jinding Town, Lanping County, Yunnan Province, China.

Material examined: — CHINA, Yunnan Province, Lanping County, Bijiang River (N 26°22.7187′ E 99°23.4924′), from freshwater sediment, 1 December 2017, Li Xianfu. Holotype CGMCC3.20895 , deposited in the China General Microbiological Culture Collection Center. Ex-type culture DLUCC26-1 , preserved in the Dali University Culture Collection.

Description: — Saprobic on soil. Isolation rapidly grows on PDA, reaching a colony-diameter of 55 mm at 26 °C within 6 days. Colonies on PDA whitish to reddish, cottony. Mycelium hyaline, septate, branched. Conidiophore hyaline, erect, occasionally produces a long branch at the base, forms an irregularly swollen node at the apex, sometimes produces more nodes by producing a short branch near the apex or by repeated elongation of conidiophore, 5–22 conidia borne in each node. 67.5–280.5 (176.7) μm long, 3.5–7.5 (5.9) μm wide at the base, gradually tapering upwards to a width of 2.0–5.5 (4.0) um below the first node. Conidia hyaline, pyriform or obovoid, 1-septate, slightly constricted at the septum, rounded at the apex, the basal cell is smaller than the distal cell, 8.5–18.5 (12.74) × 15.5–32.0 (22.80) μm. Chlamydospores spherical, ellipsoidal or cylindrical, in bead-like chains, smooth, 8.5–26.0 (16.04) × 11.5–47.5 (21.34) μm. Capturing nematodes by adhesive three-dimensional networks.

Additional material examined: — CHINA, Yunnan Province, Nujiang City, Lanping County, Bijiang River , N 26°22.7187′ E 99°23.4924′, from freshwater sediment, 1 December 2017, Li Xianfu. Living culture YL202 .

Taxonomic Discussion: —Phylogenetically, Arthrobotrys jindingensis cluster together with A. botryospora , A. latispora , A. robusta and A. cladodes with high support values (96% MLBS and 0.94 BYPP). Morphologically, A. jindingensis differs from A. botryospora , A. latispora , A. robusta and A. cladodes by their septum number and position of conidia. Most conidia of A. jindingensis produce one septum near the base, while the septum of A. latispora , A. cladodes and A. robusta is located in the center of the conidia, and most conidia of A. botryospora are aseptate ( Su et al. 2011, Drechsler 1937, Duddington 1951, Barron 1979). Based on the above, combined with phylogenetic analysis, we propose this species as a new species of Arthrobotrys .

Figures

FIGURE 2. Arthrobotrys jindingensis (CGMCC3.20895, Holotype!). a Colony. b, c Conidia. d Chlamydospores. e Adhesive networks. f Conidiophores. Bars: a=1.0 cm, b, c, d, e, f=20 um