Morphological Studies and Phylogenetic Analyses Unveil Two Notable New Species of <i>Russula</i> Subg. <i>Heterophyllinae</i> from China
2024
Bin Chen | Junfeng Liang | Fei Yu
<i>Russula</i>, a prominent genus of ectomycorrhizal fungi, is notably abundant and diverse in China. We present here the findings from studies on various Chinese <i>Russula</i> collections. Two notable species within subg. <i>Heterophyllinae</i>, namely <i>Russula leucoviridis</i> and <i>R. subswatica</i>, were described and illustrated based on comprehensive morphological characteristics and molecular evidence. Morphologically, <i>Russula leucoviridis</i> is characterized by its pastel-green to green pileus center with light-yellow spots, a white to greenish-white pileus margin, and a cuticle that cracks and breaks into small green patches after maturation, whereas <i>R. subswatica</i> is distinguished by an infundibuliform pileus with a deeply depressed center after maturation, a light-orange to grayish-orange pileus center, and a yellowish-white to light-orange margin with a purplish to purplish-black hue, and a white to yellowish-white stipe that exhibits a purplish hue at the junction with the pileus. The phylogenetic analyses were conducted using a combined dataset of ITS, nrLSU, <i>RPB2,</i> and mtSSU. Relying on both morphological characteristics and multigene phylogeny, the former species is classified within subsect. <i>Virescentinae</i>, while the latter is affiliated with subsect. <i>Griseinae</i>. In this study, we provide new scientific data that enhance the comprehension of species diversity within the subgenus <i>Heterophyllinae</i> in China.
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