Coniolepiota alexandri (Agaricaceae, Basidiomycota), a new species in the formerly monotypic genus and a new record of C. spongodes, from Vietnam

Coniolepiota, a genus within the family Agaricaceae, described in 2011, has been considered monotypic, embracing one species, C. spongodes, distributed in tropical Asia. Based on the morphological study and molecular analysis, two species of Coniolepiota viz. C. spongodes and C. alexandri are recognized from Southern Vietnam. Coniolepiota spongodes, a new record to Bu Gia Map National Park (Binh Phuoc), possesses attractive lilac basidiomata of medium size with flocculose squamules, white spores, and T-shaped pileal elements. Coniolepiota alexandri, proposed as a new species from Cat Tien National Park (Dong Nai), shares all the features listed above but has a different colour (white) of basidiomata. Detailed descriptions of the new species and the new record are presented herein. Field photographs of the collected basidiomata, illustrations of the microscopic structures, and phylogenetic trees generated from datasets of nrITS and LSU sequences, are provided.