ArticleInternational microbiology : the official journal of the Spanish Society for Microbiology2026
Discovery of Trichoderma frianum sp. nov. from India: a new member of the Trichoderma harzianum species complex (Harzianum clade).
Article in International microbiology : the official journal of the Spanish Society for Microbiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Trichoderma frianum sp. nov., a wood-inhabiting species from India, is described based on morphological characteristics and molecular phylogenetic analyses. This taxon is congruent with the morphological species concept of T. harzianum sensu lato, characterized by pyramidal conidiophores and cruciate phialidic whorls with fewer than five phialides. However, it differs by producing verticils that bear up to seven divergent phialides. Phylogenetic analyses based on a combined dataset of the translation elongation factor 1-alpha (tef1) and RNA polymerase II second-largest subunit (rpb2) gene regions confirmed the placement of T. frianum within the T. harzianum species complex (THSC) of the Harzianum clade. This species forms a sister lineage to T. anaharzianum, T. neotropicale, T. lixii, T. xixiacum, and T. lentinulae, with the pairwise homoplasy index (PHI) test supporting their classification as distinct species. Comparative sequence analyses revealed that T. frianum possesses unique tef1 and rpb2 sequences that do not meet the ∃!(rpb2
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