Two new Russula species (fungi) from dry dipterocarp forest in Thailand suggest niche specialization to this habitat type

Phylogenetic analyses

A total of 21 sequences were newly generated and deposited in GenBank (Supplementary Table 1). The concatenated sequence alignment of the three loci comprised 100 sequences (38 for ITS, 30 for rpb2 and 32 for mtSSU) from 43 collections (Supplementary Table 1). The alignment was 2,004 characters long, including gaps. Multi-locus trees generated from ML and BI analyses showed similar topologies without any supported topological conflict. The multi-locus phylogeny (Fig. 1) confirmed placement of all Thai collections within the well-supported R. subsect. Amoeninae (ML = 99, BI = 1.0). Five collections from northeastern Thailand and two collections from northern Thailand form two strongly supported clades and are described below as the new species R. bellissima sp. nov. and R. luteonana sp. nov. The new species are not resolved as sister. The first species,…