Pseudodactylaria yunnanensis Y.R. Sun, H.W. Shen & K.D. Hyde, 2025

Sun, Ya-Ru, Shen, Hong-Wei, Liu, Ning-Guo, Al-Otibi, Fatimah O., Wang, Yong, Jayawardena, Ruvishika S. & Hyde, Kevin D., 2025, Pseudodactylaria yunnanensis sp. nov. (Pseudodactylariaceae) from China, Phytotaxa 701 (2), pp. 189-198 : 192-194

Pseudodactylaria yunnanensis Y.R. Sun, H.W. Shen & K.D. Hyde , sp. nov.

Index Fungorum number: IF903796

Etymology: referring to the province in which the fungus was collected.

Holotype: HKAS 131650 .

Saprobic on submerged decaying wood in a freshwater river. Asexual morph: Colonies on substrate effuse, hairy, aggregated, white, with snowflake, glistening conidial masses at apex. Mycelium partly superficial. Conidiophores macronematous, mononematous, solitary, erect, simple or branched, cylindrical, straight or flexuous, septate, hyaline, up to 75 μm long, around 4 μm wide. Conidiogenous cells polyblastic, integrated, sympodial, terminal and intercalary, denticulate, cylindrical, hyaline, 7.5–31.5 × 2.5–5 μm (x = 20 × 4 μm, n = 20); denticles numerous, cylindrical, flattopped. Conidia solitary, acrogenous, narrowly fusiform, subtruncate at base, subobtuse at apex, hyaline, prominently guttulate, aseptate, smooth, 16.5–25 × 3–5 μm (x = 22 × 4 μm, n = 35).

Material examined: China, Yunnan Province, Nujiang Lisu Autonomous Prefecture , Fugong County, on decaying wood in a freshwater river, 4 May 2023, Y. Wang, S4514 ( HKAS 131650 , holotype) ; ex-type culture KUNCC 23- 14364 .

Notes: Pseudodactylaria yunnanensis formed an inner clade related to P. camporesiana , P. fusiformis and P.hydei in the muti-gene phylogenetic tree ( Figure. 1 ). In morphology, P. yunnanensis differs from P. camporesiana by its hyaline conidiophores while the base of conidiophores is brown in P. camporesiana ( Hyde et al. 2020) . Pseudodactylaria yunnanensis is different from P. fusiformis in having aseptate conidia while the latter has 0–1-septate conidia, and P. yunnanensis has longer conidiophores than P. fusiformis (up to 75 μm vs. 30–50 μm) ( Lu et al. 2020). Pseudodactylaria yunnanensis is distinct from P. hydei by its aseptate conidia and shorter conidiogenous cells (7.5–31.5 × 2.5–5 μm vs. 27–46 × 4–5 µm) ( Shen et al. 2025). In addition, comparisons of ITS, LSU and tef 1-α sequences between P. yunnanensis and phylogenetically related species are provided in Table 3.

Figures

FIGURE 1. Maximum likelihood tree based on the combined LSU, ITS and tef1-α sequence data. Bootstrap support values for ML greater than 75% and PP greater than 0.95 are given near nodes as ML-BS/PP. The tree is rooted with Rhamphoria delicatula (CBS 132724) and R. pyriformis (CBS 139024). The new taxon is indicated in red. The Ex-type strains are marked with “T”.