New species of <i>Colletotrichum</i> from forest trees in China: <i>Colletotrichum archidendri, Colletotrichum brunnis</i>, and <i>Colletotrichum litseae</i>

Leaf samples displaying necrotic lesions were collected from Archidendron lucyi (Fabaceae), Litsea pungens (Lauraceae), and Malus hupehensis (Rosaceae) in China. Fungal strains isolated from these symptomatic tissues were assignable to Colletotrichum. Species delimitation relied on multilocus phylogeny, with colony and morphological characters documented for comparison and formal description. Three new species were identified and described, namely, Colletotrichum archidendri in the dracaenophilum complex and C. litseae and C. brunni in the gloeosporioides complex. Detailed morphological descriptions and illustrations are provided for each species. This study also expands the known host range of Colletotrichum and contributes to the understanding of species diversity within the genus.研究人员从中国境内的Archidendron lucyi（豆科Fabaceae）、Litsea pungens（樟科Lauraceae）以及Malus hupehensis（蔷薇科Rosaceae）植株上采集了带有坏死病斑的叶片样本。从上述病征组织中分离获得的真菌菌株均归属炭疽菌属（Colletotrichum）。物种界定以多位点系统发育分析为依据，并对菌落与形态学特征进行了系统记录，用于后续对比及正式分类描述。本研究共鉴定并描述了3个炭疽菌属新种，分别为隶属于龙血树炭疽菌复合群（dracaenophilum complex）的Colletotrichum archidendri，以及隶属于胶孢炭疽菌复合群（gloeosporioides complex）的C. litseae与C. brunni。每个新种均配有详细的形态学描述与特征插图。本研究同时拓宽了炭疽菌属的已知寄主范围，为深化该属物种多样性的研究提供了参考依据。