Arthrobotrys gongshanensis Y.Q Yang & X.Y Yang, 2023

Yang, Yao-Quan, Zhang, Fa, Li, Zheng-Qiang, Zhou, Fa-Ping, Yang, Xiao-Yan & Xiao, Wen, 2023, Morphological and multigene phylogenetic analyses reveal two new nematodetrapping fungi (Arthrobotrys, Orbiliaceae) from Yunnan, China, Phytotaxa 591 (4), pp. 263-272 : 268

Arthrobotrys gongshanensis Y.Q Yang & X.Y Yang sp. nov. ( FIGURE 2 )

IndexFungorum: IF559554

Etymology: —The species name “gongshanensis” refers to the name of the sample collection site: Gongshan County, Nujiang City, Yunnan Province, China.

Material examined: — CHINA, Yunnan Province, Nujiang City , Gongshan County, from forest soil (27°45'2.46"N 98°40'23.78"W), 1 December 2017, Zhang Fa. (Holotype CGMCC3.23753 , deposited in the China General Microbiological Culture Collection Center); ex-type culture DL87 .

Description: — Saprobic on soil. Colonies white, cottony and grew rapidly on PDA, reaching a colony diameter of 55 mm within 10 days at 26 °C. Mycelium colourless, septate, branched. Conidiophores hyaline, erect, septate, unbranched, produce 1–5 short denticles near the apex and bear single conidium on each denticle, 143–277 μm (x̅= 184 µm, n = 50) long, 3–6 μm (x̅= 3.9 µm, n = 50) wide at the base, 2–4.5 μm (x̅= 3.1 µm, n = 50) wide at apex. Conidia hyaline, smooth, subfusiform to elongate-obovoid, 1–4-septate, mostly 2 or 3-septate, 23–47 × 11.5–23 μm (x̅ = 38 × 16.7 μm, n = 50). Chlamydospores globose to ellipsoidal, chain growth. Capturing nematodes by mean of adhesive networks.

Additional material examined: — CHINA, Yunnan Province, Nujiang City , Gongshan County, 27°45’2.46”N 98°40’23.78”E, from forest soil, 1 December 2017, Zhang Fa. Living culture: DLUCC30 .

Notes: Phylogenetically, Arthrobotrys gongshanensis forms a sister lineage to A. lanpingensis (95% MLBS, 0.92 BYPP). Morphologically, both of them produce subfusiform or elongate-obovoid conidia with 1–4-septate. However, they can be easily distinguished by their conidiophores. The conidiophores of A. gongshanensis produce 1–5 short denticles near the apex and bear 1–5 conidia, while the conidiophores of A. lanpingensis are simple and bear only 1 conidium ( Zhang & Hyde 2014).

Figures

FIGURE 2. Arthrobotrys gongshanensis (CGMCC3.23753, holotype!). a Colony on PDA. b, c Conidia. d Chlamydospores. e Trapping device: adhesive networks. f Conidiophores. Bars: a =10 mm; b-f =20 μm.