Taxonomic study of Endogonaceae in the Japanese islands: New species of <i>Endogone, Jimgerdemannia</i>, and <i>Vinositunica</i>, gen. nov.

Species of Endogonaceae (Endogonales, Mucoromycotina) are characterized by the formation of relatively large sporocarps and zygosporangia. Numerous species in this family remain undescribed or have unclear phylogenetic positions. In Asia specifically, the species diversity of this family is almost completely unknown. However, many mycobionts of bryophytes belonging to several novel clades in Endogonaceae have recently been identified phylogenetically. Therefore, establishing a robust taxonomic system for this family is essential. We obtained numerous sporocarps of undescribed Endogonaceae-like species from the Japanese islands. Morphological observation and multilocus phylogenetic analysis of nuc 18S rDNA (18S), nuc 28S rDNA (28S), and portions of two nuclear protein-coding regions—translation elongation factor 1-alpha (<i>tef1</i>) and RNA polymerase II large subunit (<i>rpb1</i>)—from these species resulted in the description of one new species each of <i>Endogone</i> and <i>Jimgerdemannia</i> and two new species of <i>Vinositunica</i>, gen. nov. Because <i>Vinositunica</i> is characterized by purplish sporocarps and red-wine-colored chlamydospores up to 700 μm in diameter, we emended the definition of Endogonaceae.