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Issue: Vol. 607 No. 2: 8 Aug. 2023
Type: Article
Published: 2023-08-08
DOI: 10.11646/phytotaxa.607.2.4
Page range: 151-159
Abstract views: 222
PDF downloaded: 17

Helminthosporium paraoligosporum sp. nov., a new ascomycetous fungus from Ontario, Canada

Laboratory of Plant Pathology; Swift Current Research and Development Centre; Agriculture and Agri-Food Canada; Swift Current; Saskatchewan; S9H 3X2; Canada
Laboratory of Mycology; Nature Research Centre; LT 08406; Vilnius; Lithuania
Fungi Massarinaceae Tilia spp. taxonomy new species Southern Ontario

Abstract

A novel anamorphic ascomycetous fungus, Helminthosporium paraoligosporum (Pleosporales, Ascomycota), isolated from branches of linden trees is described and characterized. The species is morphologically distinct from other Helminthosporium spp. by shorter conidiophores and conidia, and culture characteristics. Phylogenetic analysis of a combined set of ITS and LSU sequence data also supports the establishment of a new species. H. paraoligosporum is clustered with H. caespitosum, H. oligosporum, and H. tiliae. The species in this clade have similar morphological characteristics and host affiliation. In particular, conidiophores of the species (except H. tiliae) can be reduced to elongated conidiogenous cells. H. caespitosum is associated with Betula spp., while the other species in this clade have been collected from Tilia spp. only.

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