Biconidium H. Y. Wang & Y. F. Han, 2025

Wang, Hai-Yan, Dong, Chunbo, Zhang, Yan-Wei, Chen, Wan-Hao & Han, Yan-Feng, 2025, Biconidium sinense gen. et sp. nov. (Hypocreales, Bionectriaceae) and Didymocyrtis shanxiensis sp. nov. (Phaeosphaeriaceae, Didymocyrtis) isolated from urban soil in China, MycoKeys 116, pp. 327-344 : 327-344

Biconidium H. Y. Wang & Y. F. Han gen. nov.

Etymology.

Referring to the bicellular conidia.

Description.

Mycelium hyaline, septate, smooth, thin-walled. Conidiophores hyaline, septate, smooth-walled, solitary, straight, (sub-) erect, arising directly from hyphae, unbranched or branched, bearing 1–5 levels with 1–6 phialides per node. Conidiogenous cells enteroblastic, monophialidic, lateral or terminal, awl-shaped, hyaline, smooth, with globose to cylindriform thickening at conidiogenous loci. Conidia bicellular, podiform, unsymmetrically at both ends, hyaline, thick-walled, smooth, arranged in slimy heads. Chlamydospores and sexual morph absent.

Type species.

Biconidium sinense H. Y. Wang & Y. F. Han

Notes.

Three isolates from green soil of sewage treatment plant clearly form an independent clade on the ITS and LSU tree (Fig. 1 ), and are phylogenetically segregated from other genera, representing the new species with conidiogenous cells with globose to cylindriform thickening at conidiogenous loci and podiform conidia arranged in slimy heads. Therefore, we introduce Biconidium as a new genus to accommodate this species.

Figures

Figure 1. Phylogenetic tree of Bionectriaceae constructed from the dataset of ITS and LSU. Notes: Statistical support values (ML / BI) were shown at nodes. ML bootstrap values ≥ 50 % and posterior probabilities ≥ 0.50 are shown above the internal branches. ‘ – ’ indicates the absence of statistical support (< 50 % for bootstrap proportions from ML analysis; < 0.50 for posterior probabilities from Bayesian analysis). Three new strains are shown in blue font.