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

Sydowia 78: 113-121

Published online on November 11th, 2025

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;

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