Two new endophytic species, Paraconiothyrium sechii and Poaceascoma brasiliense, from Brazil

Deyse Viana dos Santos, Thays Gabrielle Lins de Oliveira, Rejane Maria Ferreira da Silva, Cristina Maria de Souza-Motta, Antônio Félix da Costa, José Luiz Bezerra & Gladstone Alves da Silva

Sydowia 77: 245-258

Published online on December 17th, 2024

During a survey in Brazil we isolated two new species of endophytic fungi, Paraconiothyrium sechii sp. nov. (Didymosphaeriaceae) and Poaceascoma brasiliense sp. nov. (Lentitheciaceae), from the leaves and roots of chayotes (Sechium edule). Morphological and phylogenetic analyses using internal transcribed spacer nrDNA, large subunit nrRNA, small subunit nrRNA, and RNA polymerase II revealed that both species were distinct from other species of their genus. Paraconiothyrium sechii was morphologically characterised by globose to subglobose pycnidial conidiomata, discrete conidiogenous cells, and ampulliform to globose or subcylindrical, aseptate, ellipsoid, and cylindrical conidia rounded at both ends. Notably, Poaceascoma brasiliense was non-sporulating on the potato dextrose, malt extract, and oatmeal agar culture media under different conditions.

Keywords: Pleosporales, Sechium edule, taxonomy.

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