taxonID	type	description	language	source
F46387BAFFCD8B56FF21FB2CFC1DF7DE.taxon	etymology	Etymology: — The epithet ‘ youyangensis ’ refers to the collecting locality, Youyang county (Chongqing, China). Type: — CHINA, Chongqing Municipality, Youyang County, on diseased leaves of Fagopyrum esculentum, 25 October 2023, J. X. Deng (YZU-H- 2023260, holotype), ex-type culture YZU 234157. Description: — Colonies on PDA entire, white, aerial mycelium luxuriance, felty, white to grey-olivaceous, villiform, reverse light brown in the center, 53.5 – 54.2 mm in diam. On PCA, 7 days at 22 ℃, mycelium superficial, helical stripes, white to grey hyphae, conidiophores arising from substrate or lateral of aerial hyphae, straight or curved, dark brown; conidia 1 – 5 units per chain, yellow brown to dark brown, ovate, elliptic or ovoid to obpyriform, 21 – 52 (– 57) × 12 – 20 μm, 1 – 5 transverse septa, 0 – 2 longitudinal septa, beakless or with an apical extension (beak) around 7 – 15 μm. On V 8 A, conidiophores straight or curved, conidia 1 – 4 units in a chain, brown to dark brown, narrow-ovoid to ovoid, 25 – 47 (– 52) × 10 – 16 μm, 1 – 6 transverse septa, 0 – 2 longitudinal septa, slightly narrow at the septa, with one longitudinal or oblique or Y-shaped disto- septum in some transverse divisions, thin-walled. Note: — Phylogenetically, Alternaria youyangensis sp. nov. falls into a unique branch within sect. Alternaria based on sequence analyses of ITS, GAPDH, TEF 1, RPB 2, Alt a 1, EndoPG, and OPA 10 - 2 gene regions. The isolates of A. youyangensis were close to A. baoshanensis (ex-type, MFLUCC 21 - 0124), A. koreana (ex-type, SPL 2 - 1), A. orobanches (ex-type, MFLUCC 21 - 0137) and A. ovoidea (ex-type, MFLU 21 - 0782) (Fig. 1). Compared with the single gene sequence between A. youyangensis isolates and previous mentioned close species, there are 1 / 512 differences in ITS, 4 / 592 in GAPDH, 8 / 217 in TEF 1, 7 / 970 RPB 2 and 13 / 471 in Alt a 1 for A. baoshanensis; 1 / 512 differences in ITS, 1 / 592 in GAPDH, 10 / 970 in RPB 2, 8 / 471 in Alt a 1 and 12 / 457 in EndoPG for A. koreana; 49 / 512 differences in ITS, 4 / 592 in GAPDH and 1 / 471 in Alt a 1 for A. orobanches; 1 / 512 differences in ITS, 4 / 592 in GAPDH, 7 / 217 in TEF 1, 7 / 970 RPB 2 and 12 / 471 in Alt a 1 for A. ovoidea. Morphologically, A. youyangensis sp. nov. (1 – 5 conidia per chain) differentiated from its closely related species of A. baoshanensis, A. koreana, A. orobanches, and A. ovoidea (solitary or up to 3 conidia per chain) significantly by its sporulation patterns.	en	Huang, Jia Hui, Gou, Ya Nan, Nwe, Zin Mar, Aung, Sein Lai Lai, Deng, Jian Xin, Li, Mei Jia (2024): Alternaria youyangensis sp. nov. (Ascomycota: Pleosporaceae) from leaf spot of Fagopyrum esculentum in China. Phytotaxa 672 (2): 176-186, DOI: 10.11646/phytotaxa.672.2.4, URL: https://doi.org/10.11646/phytotaxa.672.2.4
