Sesquicillium aquaticum (D. F. Bao, K. D. Hyde & Z. L. Luo) S. C. He, K. D. Hyde & Jayaward, [as ‘ aquatica’] comb. nov. Basionym. Clonostachys aquatica D. F. Bao, K. D. Hyde & Z. L. Luo, Fungal Diversity, (2023). Holotype. HKAS 125804. Description and illustration. See Bao et al. 2023. Notes. Clonostachys aquatica was established by Bao et al. (2023) based on ITS and tub 2 sequence data (holotype HKAS 125804). Through the study of Bao et al. (2023), C. aquatica clustered as a clade sister to C. rossmaniae with strong support (94 % MLB, 98 % MYPP). Following Bao et al. (2023), we added 28 S, tef 1 and rpb 2 sequence data, and the results showed that C. aquatica clustered with Sesquicillium essexcoheniae (100 % MLB, 0.97 BYPP), forming a successive sister clade with S. rossmaniae (99 % MLB, / 1.00 BYPP) (Fig. 1). Clonostachys aquatica shows a closer relationship with Sesquicillium in phylogenetic analysis. Therefore, based on phylogenetic analysis, we propose C. aquatica as a synonym of S. aquaticum.

Published as part of He, Shucheng, Thiyagaraja, Vinodhini, Bhunjun, Chitrabhanu S., Chomnunti, Putarak, Dissanayake, Lakmali S., Jayawardena, Ruvishika S., Yang, Hongde, Zhao, Yun Wei, Al-Otibi, Fatimah, Zhao, Qi & Hyde, Kevin D., 2025, Morphology and multi-gene phylogeny reveal three new species of Clonostachys and two combinations of Sesquicillium (Bionectriaceae, Hypocreales) from Xizang, China, pp. 43-66 in MycoKeys 115 on pages 43-66, DOI: 10.3897/mycokeys.115.139757