Abstract
Two novel species of Russula (Russulaceae, Russulales), R. coronaspora Y.Song sp. nov. and R. minor Y.Song sp. nov. belonging to subgenus Russula crown clade, are described based on both morphological and phylogenetic evidence. In morphology, R. coronaspora sp. nov. is mainly characterized by its distinct spores ornamented with sparse, cylindrical and isolated spines, which resemble coronavirus, and gelatinized pileipellis with pileocystidia mostly septate and sometimes branched; R. minor sp. nov. possesses a very small basidiocarp with pileus less than 2.5 cm in diameter., small basidia, easily peeling and gelatinized pileipellis with slender terminal cells and abundant SV+ pileocystidia. Positions of the two new species in both phylogenetic trees based on ITS and 5-locus sequences (nLSU, mtSSU, rpb1, rpb2 and tef1) confirm their distinct taxonomic status.
Highlights
Russula Pers. is the type genus of family Russulaceae and the largest genus in the order Russulales
Specimens were collected from Dinghushan Biosphere Reserve (DHSBR, 112°30′39′′– 112°33′41′′ E, 23°09′21′′–23°11′30′′ N) from June to October during the years 2016–2019
The proposed two novel species, Russula coronaspora Y.Song sp. nov. and R. minor Y.Song sp. nov., are both nested in subgen
Summary
Russula Pers. is the type genus of family Russulaceae and the largest genus in the order Russulales. Russula can be considered as the second most taxonomically diverse genus of ectomycorrhiza-forming fungi after the genus Cortinarius (Pers.) Gray, playing important ecological roles in the maintenance of different ecosystems (Looney et al 2016). At least 78 species of Russula are consumed and 30 species are used in traditional medicine for at least 440 years in China (Wu et al 2019). Buyck et al (2018, 2020) reorganized the infrageneric taxonomic system of Russula employing a 5-locus phylogenetic analysis and divided the genus into 8 subgenera, in which subgen. Russula was further separated into a core and a crown clade. Species of crown clade mainly characterized by the very small to very large species, equal gills never forked, spore print color from white to deep yellow, spores with
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