Talaromyces oaxaquensis sp. nov. section Talaromyces (Trichocomaceae, Eurotiales) isolated from pseudostems of banana plants in Mexico

Background: Talaromyces is a genus of Eurotiales divided into eight sections. The species are adapted to habitats such as soil, processed foods, immunocompromised patients, and plants. Objective: Identify three Talaromyces isolating from pseudostems of Musa sp. AAB ‘Manzano’. Methods: The morphology of Talaromyces colonies in recommended media was analyzed, ascospores were observed under scanning electron microscopy, and a phylogeny of the concatenated ITS-RPB1-RPB2 was performed. Results and conclusion: The three strains are clustered in the same clade within the section Talaromyces, being T. rubicundus the most related species. The isolates morphology, color, and growth rate are distinguishable from T. rubicundus and other related species. No conidia formation was detected under any conditions, but cleistothecia are widely produced on an oatmeal-agar medium, which harbors asci with ascospores with spiny ornamentation. We propose these strains are representative of Talaromyces oaxaquensis sp. nov.