Phaeobotryon aplosporum M. Pan & X. L. Fan

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 aplosporum M. Pan & X. L. Fan , Mycol. Prog. 18 (11): 1356 (2019)

Descriptions.

See Pan et al. 2019.

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 2375 , living culture CFCC 70810 , CFCC 70811 ) .

Notes.

Phaeobotryon aplosporum was first identified in Rhus typhina and Syzygium aromaticum ( Pan et al. 2019) . Since then, this species has also been reported in Juglans mandshurica ( Lin et al. 2023) , Wisteria floribunda , Malus sp. , and Kerria japonica ( Hattori and Masuya 2023) . In this study, we observed the asexual morph of P. aplosporum (Fig. 4 ), which features unilocular conidiomata that differ from previously published descriptions for other hosts. It is known from previous literature reports that P. quercicola exhibits both unilocular conidiomata and multilocular conidiomata ( Phillips et al. 2008), and P. cupressi mostly unilocular conidiomata on pine needles and mostly multilocular conidiomata on Populus twigs ( Abdollahzadeh et al. 2009). This suggests that both unilocular and multilocular conidiomata may coexist within the same species in this genus. Additionally, the other characteristics of P. aplosporum in L. olgensis we observed (Fig. 4 ) are consistent with those noted from other hosts. Phylogenetically, the isolates CFCC 70810 and CFCC 70811 clustered within a clade with P. aplosporum , demonstrating high statistical support (MP / ML / BI = 90 / 98 / 0.99) (Fig. 1 ). Therefore, the isolates CFCC 70810 and CFCC 70811 are identified as P. aplosporum . This study extends the host range of P. aplosporum 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 4. Phaeobotryon aplosporum (BJFC - S 2375) A habit of conidiomata on twig B longitudinal section through a conidioma C transverse section of a conidioma D, E conidiogenous cells and conidia F conidia G colony on PDA after 7 days. Scale bars: 500 µm (A); 50 µm (B, C); 10 µm (D – F).