In: Sydowia 78, (2025): 113-121; ISSN 0082-0598, DOI 10.12905/0380.sydowia78-2026-0113, Published online on November 12th, 2025

Amphibambusa xishuangbannaensis, a new bambusicolous ascomycete (Cainiaceae, Xylariales) from Southwest China

Yulin Ren, Lili Liu, Qing Yang, Kamran Habib, Nalin N. Wijayawardene, Jichuan Kang, Qirui Li,* & Milan C. Samarakoon*

1 Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand
2 Department of Pharmacognosy, School of Pharmaceutical Sciences, Guizhou Medical University, University Town,
Guian New District, Guizhou 561113, People’s Republic of China
3 Center for Yunnan Plateau Biological Resources Protection and Utilization, College of Biological Resource and Food
Engineering, Qujing Normal University, Qujing, Yunnan 655011, People’s Republic of China
4 Engineering and Research Centre for Southwest Bio-Pharmaceutical, Resources of National Education Ministry of China,
Guizhou University, Guiyang, 550025, People’s Republic of China

* e-mails: lqrfungi2019@aliyun.com, milanchameerasamar.s@cmu.ac.th

Ren Y.L., Liu L.L., Yang Q., Habib K., Wijayawardene N. N., Kang J.C., Li Q.R. & Samarakoon M.C. (2025) Amphibambusa
xishuangbannaensis, a new bambusicolous ascomycete (Cainiaceae, Xylariales) from Southwest China – Sydowia 78: 113–121.

Amphibambusa xishuangbannaensis, sp. nov., is described and illustrated from Xishuangbanna, Yunnan Province, China. Phylogenetic analyses based on internal transcribed spacers (ITS) and large subunit (LSU) rDNA regions, along with morphological data, distinguish it from other known Amphibambusa species. The new taxon is similar to other Amphibambusa species in having solitary, scattered, immersed ascomata and a centric ostiole surrounded by a white margin. Amphibambusa xishuangbannaensis has a wider peridium (40–52 µm wide) and larger ascospores (39–47 × 5–6 µm) compared to A. bambusicola (peridium 20–30 µm wide; ascospores 25–27 × 5.5–6 µm). Based on molecular genetic data, A. xishuangbannaensis appears to be a sister species to A. aquatica and A. bambusicola with 76% ML support value.

Keywords: fungal diversity; microfungi; xylarialean taxa; 1 new species.