Colletotrichum menezesiae A. Reis, W.A.S. Vieira & M.P.S. Câmara, 2023

Vieira, Willie Anderson Dos Santos, Costa, Christiane Almeida Da, Câmara, Marcos Paz Saraiva, Michereff, Sami Jorge & Reis, Ailton, 2023, Colletotrichum menezesiae sp. nov.: a novel species causing anthracnose on chayote in Brazil, Phytotaxa 597 (1), pp. 80-86 : 84

Colletotrichum menezesiae A. Reis, W.A.S. Vieira & M.P.S. Câmara , sp. nov. ( Fig. 2 )

MycoBank: MB848223

Systematic position:—Ascomycota, Pezizomycotina, Sordariomycetes, Hypocreomycetidae, Glomerellales , Glomerellaceae .

Type:— BRAZIL. Minas Gerais: Ibirité , from anthracnose lesions on Sicyos edulis fruit, Feb 2022, A. Reis. Holotype VIC49404 . Ex-type living culture COAD3523 .

Etymology:—Named in honour of Maria Menezes, retired mycologist from Universidade Federal Rural de Pernambuco (UFRPE), for her contribution to Brazilian mycology and phytopathology.

Colonies on PDA apricot coloured from the aerial view, reverse orange, aerial mycelium sparse, growth rate at 25 °C 5.7–6.3 mm.dia(average 5.9 ± 0.3 mm. dia-1). Conidiogenous cells hyaline, smooth-walled, cylindrical to ampulliform, often extending to form a new conidiogenous locus (percurrent proliferation). Conidiophores hyaline, smooth-walled, septate, unbranched, 8.4–23.7× 2.4–3.2 μm (av. 14.7 ± 4.4 × 2.9 ± 0.3 μm) on PDA, 12.4–19.7× 3–3.2 μm (av. 16.3 ± 3.2 × 3.23 ± 0.1 μm) on Sicyos edulis . Conidia one-celled, hyaline, smooth-walled, cylindrical with rounded ends, contents appearing granular. Conidia on PDA 9.6–13.8 × 3.4–4.4 μm (av. 10.7 ± 1.1 × 3.8 ± 0.3 μm). Conidia on Sicyos edulis 8.2–13.3 × 2.9–3.8 μm (av. 11.1 ± 1.6 × 3.4 ± 0.2 μm). Appressoria in slide cultures, single, medium to dark brown, smooth-walled, irregular shape, solitary, 6.2–8.9 × 4.2–8 μm (av. 7.2 ± 0.8 × 5.7 ± 0.9 μm). Setae produced only on Sicyos edulis , abundant, long, dark brown, smooth-walled, two septate, sometimes with constriction in the apical septum, base truncate, tip acute, 40–65 × 2.9–4 μm (av. 51.5 ± 7.5 × 3.3 ± 0.3 μm). Sclerotia, chlamydospores, and sexual morph not observed.

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Geographic distribution and host range:— Known from Sicyos edulis from Ibirité (Minas Gerais state) and Tijucas (Santa Catarina state, isolate CMM3469 ), Brazil.

Figures

FIGURE 2. Colletotrichum menezesiae COAD3523, ex-holotype culture. A–B. Cultures on PDA, 7 d growth, from above (A) and below (B). C, E. Conidiophores and conidiogenous cells from PDA (C) and Sicyos edulis (E). F–G. Appressoria. H–I. Setae on S. edulis. D, J. Conida from PDA (D) and S. edulis (F). Scale bars: F–G, 5 µm; 10 µm for the others.