Phaeobotryon rhois C. M. Tian, X. L. Fan & K. D. Hyde

Zhu, Yeting, Liang, Yingmei & Peng, Cheng, 2025, New species and records of Phaeobotryon (Botryosphaeriales, Botryosphaeriaceae) from Larix in China, MycoKeys 112, pp. 1-15 : 1-15

Phaeobotryon rhois C. M. Tian, X. L. Fan & K. D. Hyde , Phytotaxa 205 (2): 95 (2015)

Descriptions.

See Fan et al. 2015.

Materials examined.

China • Jilin Province, Yanbian Korean Autonomous Prefecture, Yanji City, Maoershan National Forest (42°51'12.96"N, 129°28'24.06"E), alt. 297 m, on branches of Larix olgensis , 7, Sept, 2022, C. Peng, X. Y. Zhang ( BJFC - S 2374 , living culture CFCC 70812 , CFCC 70813 ) .

Notes.

Phaeobotryon rhois was first discovered and reported on Rhus typhina ( Fan et al. 2015) . This species has also been isolated from diseased branches of the hosts Dioscorea nipponica , Platycladus orientalis , and Rhamnus davurica ( Pan et al. 2019) , as well as from Populus alba var. pyramidalis ( Lin et al. 2023) . Morphologically, its asexual morph (Fig. 5 ) aligns with the description provided by Fan et al. (2015). Phylogenetically, the isolates CFCC 70812 and CFCC 70813 clustered within a clade alongside P. rhois , demonstrating high statistical support (MP / ML / BI = 96 / 99 / 0.99) (Fig. 1 ). The current study expands its host range to include L. olgensis .

Figures

Figure 1. Phylogenetic tree inferred from ML analysis based on combined ITS, LSU, and tef 1 - α sequence data of Phaeobotryon isolates. The tree was rooted in Lasiodiplodia theobromae (CBS 164.96). The MP, ML (≥ 50 %), and BI (≥ 0.9) bootstrap values are given at nodes (MP / ML / BI). Isolates from this study are marked in blue, ex-type strains are marked in bold, and new species are in a colored font.

Figure 5. Phaeobotryon rhois (BJFC - S 2374) A habit of conidiomata on twig B longitudinal section through a conidioma C transverse section of a conidioma D – G conidiogenous cells and conidia H conidia I colony on PDA after 7 days. Scale bars: 500 µm (A); 50 µm (B, C); 10 µm (D – H).