Taxonomic novelties and host associations of Sordariomycetes from wetland-dwelling Poales in Thailand

<i>Poales</i> is one of the largest orders of monocotyledonous plants, comprising families such as <i>Cyperaceae</i>, <i>Poaceae</i>, and <i>Typhaceae</i>. These plant families dominate the macrophytes found in tropical lentic and lotic wetlands habitat in Prachuap Khiri Khan Thailand. This study investigated microfungi associated with wetland-dwelling <i>Poales</i> and revealed taxa belonging to <i>Chaetomiaceae</i>, <i>Naviculisporaceae</i>, <i>Pleurotheciaceae</i>, and <i>Schizotheciaceae</i> in <i>Sordariomycetes</i> were prominent. Submerged and decaying plant material from <i>Cyperaceae</i> and <i>Typhaceae</i> were gathered from the Pran Buri marshlands and the Pran Buri River, Thailand. The spatial distribution of the locations was significantly influenced by fluctuations in ocean water levels. Fungal characterization was performed using morphological analysis and multigene phylogeny, incorporating nuclear ribosomal DNA (ITS, LSU, SSU) and protein-coding loci (<i>rpb2</i>, <i>tub2</i>, <i>tef1-α</i>). This study introduces two novel species, <i>Corynascus fluvialis</i> and <i>Pseudorhypophila hyalibasiconica</i> from <i>Carex</i> sp. along with two new host records: <i>Dematipyriforma aquilariae</i> from <i>Typha</i> sp. and <i>Triangularia allahabadensis</i> from <i>Carex</i> sp. <i>Pseudorhypophila hyalibasiconica</i> is characterized by ovoid to limoniform upper cells and a hyaline conical lower cell. <i>Corynascus fluvialis</i> differs from other members of <i>Corynascus</i> by possessing angular pedicellate asci, and ascospores with a single apical germ pore. The comparisons using morphology and phylogeny of newly described taxa are provided. This study investigates the role of sustainably managed forests in the conservation of terrestrial ecosystems.