The Genus : An Updated Global Species Distribution and Phylogeny with the Description of Two New Species from Oman.

is a saprotrophic mushroom genus with small-sized basidiomata in the family Agaricaceae (Agaricales). Prior to this study, 26 species belonging to this genus have been described and published. In this study, we reported for the first time from Oman with the description of two new species. Basidiomata of the new species and were collected during the monsoon rains of summer in 2018 in the southern coastal region of Oman. Species descriptions are based on morphological and molecular characterization. Phylogenetic analyses based on internal transcribed spacer region (ITS1-5.8S-ITS2 = ITS) of the nuclear ribosomal DNA clustered the new species in the clade with strong statistical support. The new species can be distinguished from other species by its purplish pileus with umbonate disc and with the largest pileus (70-90 mm diameter) among the known species of the genus. A detailed description, photographs, line drawings, and a phylogenetic tree showing the position of both new species are provided. A dichotomous key to the known taxa of is proposed. Morphological comparisons of new species with known taxa are provided. Our observations highlight the diversity of and other lepiotaceous mushrooms in southern Oman and further document the need for additional systematic focus on the region's fungi.