Abstract

Macrofungal resources are abundant in Northeast China, but those from Shenyang and its surrounding areas remain insufficiently investigated. In this study, morphological and phylogenetic analyses were carried out on specimens collected from the vicinity of Shenyang, Liaoning Province. Phylogenetic trees were inferred using maximum likelihood and Bayesian inference methods based on sequence data from the nuclear ribosomal internal transcribed spacer (ITS) region and the nuclear ribosomal large subunit (LSU). Three new species, Descolea laevis (Bolbitiaceae), Leucocoprinus shenyangensis (Agaricaceae), and Tephrocybe umbonata (Lyophyllaceae), are described herein. Descolea laevis is characterized by pale yellow to light yellow basidiomata, a nearly smooth pileus surface, clavate to narrowly clavate cheilocystidia, fusiform to clavate pleurocystidia, and amygdaliform to limoniform, verrucose basidiospores. Leucocoprinus shenyangensis is distinguished by white to yellowish-white basidiomata, a pileus covered with light grey squamules, narrowly clavate to subcylindrical cheilocystidia, a hymenidermal pileipellis, and amygdaliform to limoniform basidiospores. Tephrocybe umbonata is characterized by orange-white to greyish-orange basidiomata, a pileus with a blunt umbo, a smooth or slightly finely fibrillose pileus surface, lageniform pleurocystidia with slightly acute apices, and amygdaliform to limoniform basidiospores. Detailed morphological descriptions, illustrations of microscopic structures, and phylogenetic evidence for the three new species are provided. The diagnostic characteristics separating the new taxa from their closely related species are also discussed.

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