taxonID	type	description	language	source
4F107711FFE7AE27FF50F9B52D02FC77.taxon	etymology	Etymology: The specific epithet " guangxiensis " refers to Guangxi Province, where the holotype specimen was collected. Specimens examined — China, Guangxi Province, Fangchenggang city, Shiwandashan National Nature Reserve, longitude 108 ° 2 ' 31.58 " E, latitude 21 ° 57 ' 12.34 " N, altitude 300 meters, on dead bamboo culm, August 9 th, 2024, Zuquan Yao, 2024 SWS 85 (GMB 4910, holotype; KUN-HKAS 146993, isotype, GMBC 4910 ex-type); GenBank accession numbers: ITS = PV 617366; LSU = PV 617364.	en	Yao, Zuquan, Ren, Yulin, Habib, Kamran, Kang, Jichuan, Li, Wenhao, Lu, Changtao, Liu, Lili, Lu, Pingzhu, Jin, Yilan, Shen, Xiangchun, Li, Qirui (2025): Amphibambusa guangxiensis (Sordariomycetes, Xylariales), A Novel Bambusicolous Fungus from Guangxi, China with an Updated Key to Genus. Phytotaxa 716 (4): 281-290, DOI: 10.11646/phytotaxa.716.4.5, URL: https://doi.org/10.11646/phytotaxa.716.4.5
4F107711FFE7AE27FF50F9B52D02FC77.taxon	description	Description: Saprobic on the surface of decaying bamboo culms, forming black round spots. Ascomata 780 – 1000 μm width, 640 – 710 μm height, immersed, solitary, scattered, globose to subglobose, black, ostiole at the center. Peridium 16 – 43 μm (x = 28 μm, n = 10) width, composed of thick walled, hyaline to brown cells of textura angularis. Paraphyses 3.1 – 6.2 μm (x = 4.4 μm, n = 10) width, filamentous, aseptate, thin-walled, with hyaline guttulate cells, non-septate. Asci 160 – 235 × 14.5 – 24.5 μm (x = 190 × 19.3 μm, n = 30), 8 - spored, unitunicate, cylindrical, short-stalked, with a J +, discshaped, subapical ring, bluing in Melzer’s reagent, 3.6 – 4.7 × 1.8 – 2.6 μm (x = 4 × 2.3 μm, n = 30). Ascospores 26 – 34 × 7.3 – 9.8 μm (x = 29.1 × 8.8 μm, n = 30), uniseriate, hyaline, fusiform, 1 - septate at the center, slightly constricted at the septum, tapering at both ends, with longitudinal striations along the entire length of the ascospore, surrounded by a mucilaginous sheath of 11 – 16 μm (x = 13.2 μm, n = 10) thick. Anamorph: Undetermined. Culture characteristics – Colonies on PDA, reached 3 cm diam. after one week, white, cottony, flat, dense, with slightly wavy margin. Not sporulating on OA nor on PDA after three months.	en	Yao, Zuquan, Ren, Yulin, Habib, Kamran, Kang, Jichuan, Li, Wenhao, Lu, Changtao, Liu, Lili, Lu, Pingzhu, Jin, Yilan, Shen, Xiangchun, Li, Qirui (2025): Amphibambusa guangxiensis (Sordariomycetes, Xylariales), A Novel Bambusicolous Fungus from Guangxi, China with an Updated Key to Genus. Phytotaxa 716 (4): 281-290, DOI: 10.11646/phytotaxa.716.4.5, URL: https://doi.org/10.11646/phytotaxa.716.4.5
4F107711FFE7AE27FF50F9B52D02FC77.taxon	materials_examined	Additional specimens examined – CHINA, Guangxi Province, Fangchenggang city, Shiwandashan National Nature Reserve, longitude 108 ° 2 ’ 31.60 ” E, latitude 21 ° 57 ’ 12.32 ” N, altitude 300 meters, on dead bamboo culm, August, 2024, Q. R Li. Yulin Ren, 2024 SWS 311 (GMB 4911; GMB 4 C 911); GenBank accession numbers: ITS = PV 617365; LSU = PV 617363. Notes: Phylogenetically (Fig. 1), Amphibambusa guangxiensis forms an independent clade, clearly distinguishing it from all the known species of the genus. Morphologically, A. guangxiensis resembles A. aquatica in the size of the ascomata (500 – 1000 μm diam., in A. aquatica) and the asci (190 – 240 × 12 – 16 μm in A. aquatica). Both species possess the largest asci in the genus, reaching up to 240 μm, while all other species have asci shorter than 200 μm (Manawasinghe et al. 2024). However, it differs in ascospore size (26 – 34 × 7.3 – 9.8 μm vs. 32 – 40 × 6 – 7.5 μm in A. aquatica) and is also phylogenetically distant (Manawasinghe et al. 2024).	en	Yao, Zuquan, Ren, Yulin, Habib, Kamran, Kang, Jichuan, Li, Wenhao, Lu, Changtao, Liu, Lili, Lu, Pingzhu, Jin, Yilan, Shen, Xiangchun, Li, Qirui (2025): Amphibambusa guangxiensis (Sordariomycetes, Xylariales), A Novel Bambusicolous Fungus from Guangxi, China with an Updated Key to Genus. Phytotaxa 716 (4): 281-290, DOI: 10.11646/phytotaxa.716.4.5, URL: https://doi.org/10.11646/phytotaxa.716.4.5
4F107711FFE7AE27FF50F9B52D02FC77.taxon	description	Amphibambusa hongheensis is similar in ascospore size to A. guangxiensis but differs in having smaller ascomata (350 – 600 μm diam. vs. 780 – 1000 μm diam. in A. guangxiensis) with protruding carbonaceous papillae surrounded by a white margin, as well as smaller asci (118 – 160 × 14 – 18 μm vs. 160 – 235 × 14.5 – 24.5 μm in A. guangxiensis) (Jiang et al. 2021).	en	Yao, Zuquan, Ren, Yulin, Habib, Kamran, Kang, Jichuan, Li, Wenhao, Lu, Changtao, Liu, Lili, Lu, Pingzhu, Jin, Yilan, Shen, Xiangchun, Li, Qirui (2025): Amphibambusa guangxiensis (Sordariomycetes, Xylariales), A Novel Bambusicolous Fungus from Guangxi, China with an Updated Key to Genus. Phytotaxa 716 (4): 281-290, DOI: 10.11646/phytotaxa.716.4.5, URL: https://doi.org/10.11646/phytotaxa.716.4.5
