Colletotrichum chrysalidocarpi Y.X. Zhang, J.W. Chen & Manawas.

Classification – Glomerellaceae, Glomerellales, Hypocreomycetidae, Sordariomycetes, Ascomycota

Index Fungorum number – IF900955; Facesoffungi number – FoF 14668

Other useful webpages – outlineoffungi.org; fungalgenera.org; Sordariomycetes.org; coelomycetes.org

Etymology – Named after the host genus, Chrysalidocarpus, on which it was found.

Holotype – MHZU 23-0206

Description – Associated with leaf spot of Chrysalidocarpus lutescens. Sexual morph: undetermined. Asexual morph: Mycelium 1–1.5 µm diam., hyaline to pale brown, smooth-walled, septate, branched. Conidiomata dark grey, scattered or in groups. Setae not observed. Conidiophores hyaline to pale brown, smooth-walled to verruculose, septate, branched. Conidiogenous cells 10– 14(–17) × 3–5 µm (av. 13 × 4 µm, n = 50), hyaline, smooth-walled, clavate. Conidia 13–17 × 4–6 µm (av. 15 × 5 µm, n = 50), hyaline, smooth-walled, aseptate, straight, clavate, ends rounded. Appressoria 6–10(–14) × 4–6(–8) µm (av. 9 × 6 µm, n = 30), single or in loose groups, medium to dark brown, smooth-walled, ovoid to ellipsoidal, outline entire.

Culture characteristics – Colonies on PDA reaching 50 mm diam. after 7 days of growth at 25 ℃, grey-white, the edge regular, rounded, mycelium lush, velvet, reverse dark green in the center, conidial masses orange.

Material examined – China, Guangdong Province, Guangzhou City, on leaf spot of Chrysalidocarpus lutescens H. Wendl (Arecaceae), April 2022, Yanhong Lin, dried culture MHZU 23-0206, holotype; ex-type living culture ZHKUCC 23-0847.

GenBank accession numbers – gapdh: OR493925, OR493924; act: OR493891, OR493890; chs-1: OR493908, OR493907; ITS: OR287501, OR287500; tub2: OR453377, OR453376.

Notes – See Zhang et al. (2023).

Colletotrichum chrysalidocarpi (MHZU 23-0206, holotype). a, b Upper and reverse view on PDA (7 d). c Conidial masses. d, e Conidiogenous cells. f Conidia. g–j Appressoria. Scale bars: d–j = 10 µm.

Maximum likelihood tree inferred from the combined ITS, gapdh, chs-1, act, and tub2 sequence data for Colletotrichum chrysalidocarpi and C. fioriniae. The tree is rooted to C. orchidophilum (CBS 632.80 and CBS 631.80). Maximum likelihood bootstrap support values equal to or greater than 75% and Bayesian posterior probabilities equal to or greater than 0.95 are given at the nodes and branches (ML/BYPP). Ex-type isolates are marked with “T”. The new isolates from South China region are indicated in red.