Colletotrichum cordae Y. X. Li & X. L. Fan, 2024

Li, Yixuan, Lin, Lu, Cao, Jing, Gan, Mingxu & Fan, Xinlei, 2024, Three new species of Colletotrichum (Glomerellales, Glomerellaceae) associated with walnut (Juglans regia) anthracnose from China, MycoKeys 108, pp. 147-167 : 147-167

Colletotrichum cordae Y. X. Li & X. L. Fan sp. nov.

Fig. 5

Etymology.

Named after Corda who established the genus Colletotrichum .

Typification.

China, Sichuan Province, Guangyuan City, Chaotian District , Longmen Valley Leisure Villa , 32 ° 39 ' 08 " N, 105 ° 55 ' 11 " E, from leaf of Juglans regia L., 10 Oct. 2023, Y. X. Li, L. Lin & X. L. Fan (holotype BJFC - S 2250 , ex-holotype culture CFCC 59618 ) .

Description.

Sexual morph not observed. Asexual morph developed on OA. Conidiomata acervular, color ranged from peach to light brown. Appressoria and Setae not observed on OA. Conidiophores directly formed on hyphae, usually degenerated into conidiogenous cells. Conidiophores hyaline, unbranched, approximately cylindrical, 16.1–28.2 × 2.5–4.5, mean ± SD = 21.0 ± 2.9 × 3.5 ± 0.5 µm, n = 50. Conidiogenous cells transparent, cylindrical, formed at the end or side of the hyphae. Conidia straight, hyaline, cylindrical, obtuse at the base, rounded at the apex, with smooth walls and granular contents, 11.8–17.7 × 4.5–6.5 µm, mean ± SD = 14.5 ± 1.1 × 5.5 ± 0.5 µm, L / W radio = 2.6, n = 50.

Cultural characteristics.

Colonies on OA initially white, rapidly growing to 4 cm after 3 d at 25 ° C, and completely covering a 6 - centimeter Petri dish after 7 d. The aerial mycelium white or gray, with a flocculent cotton-like appearance, edge white, center iron gray.

Additional material examined.

China. Sichuan Province, Guangyuan City, Chaotian District , Longmen Valley Leisure Villa , 32 ° 39 ' 08 " N, 105 ° 55 ' 11 " E, from leaf of Juglans regia L., 10 Oct. 2023, Y. X. Li, L. Lin & X. L. Fan ( BJFC - S 2251 , living culture CFCC 70160 ) .

Notes.

Two strains of Colletotrichum cordae constitute a distinct clade within the C. gloeosporioides species complex, as revealed by multi-locus phylogenetic analysis. Colletotrichum cordae is phylogenetically near to C. perseae CBS 141365, but differs by 17 nucleotide differences in concatenated alignment (7 / 573 in ITS, 5 / 281 in act, 1 / 269 in chs 1, 1 / 317 in gapdh, and 3 / 452 in tub 2) ( Sharma et al. 2017). Morphologically, C. cordae can be differentiated from C. perseae by the presence of conidia with obtuse or rounded apices.

Figures

Figure 5. Colletotrichum cordae (ex-holotype culture CFCC 59618) A colonies on OA media above and below after 5 days at 25 ° C B conidiomata on OA C, D conidiophores and conidia E, F conidia. Scale bars: 200 µm (B); 10 µm (C – F).