Four New Botryobasidium Species Discovered in East China

In a recent issue of MycoKeys, Wen Jing, Wan-Ying Li, Viktor Papp, Qian-Xin Guan, Zi-Wei Zheng, Yu-Jin Cui, and Fang Wu reported the discovery of four new species of the genus Botryobasidium from eastern Chinese forests. The study, published as MycoKeys 139:321–339 (DOI 10.3897/mycokeys.139.206012), describes B. fujianensis, B. fusisporellum, B. subconiferarum, and B. macrosporum ¹.net].

All four taxa share key morphological traits: they possess hypochnoid, floccose to cottony hymenial surfaces that are white to greyish‑white; their hyphal systems are monomitic with simple septa; and they contain tubular cystidioids. Basidia are barrel‑shaped—four or six sterigmata for fujianensis, two or four sterigmata for fusisporellum. Conidiogenous cells are polyblastic, producing aseptate, hyaline conidia in various shapes. Each species also displays distinct basidiospore forms: fujianensis has pip‑shaped spores measuring 6.0–7.9 × 2.3–3.4 µm, while fusisporellum bears fusiform spores of 5.3–6.5 × 2.3–3.0 µm. The remaining species exhibit similar features but differ subtly in spore size and ornamentation.

The authors employed a combined ITS+nLSU sequence dataset for phylogenetic analyses. Their maximum likelihood trees placed all four new species firmly within the Botryobasidium clade, separate from closely related genera such as Cantharellus and Hygrocybe. This molecular evidence corroborates the morphological distinctions and demonstrates that East China harbors previously unrecognized diversity within this wood‑inhabiting lineage ¹.net].

Beyond cataloguing new taxa, the study highlights ecological implications. These Botryobasidium species may influence nutrient cycling and forest health. Earlier work by Drs. Zhang Qiu-Yue and Cao Yu-Han on other members of Cantharellales in this region suggests that continued surveys could uncover further hidden fungal biodiversity, informing sustainable forestry practices ¹.net].

While no immediate commercial applications are noted, understanding their distribution can aid conservation efforts. The discovery underscores how detailed fieldwork coupled with modern DNA sequencing remains essential to mycology’s frontiers.