September 20, 2025

Inocybe caryicola (Inocybaceae, Agaricales), a new species from Yunnan, China

Key Points

Inocybe caryicola shows distinct morphological features, including an obvious cortina and angular basidiospores.
The study highlights the basidiospores' unique characteristics, with 11–13 nodules found on the spores.
Molecular phylogenetic analyses confirm Inocybe caryicola's position among related species in its clade.
This discovery contributes to the understanding of Inocybe diversity in Yunnan province, China.

Abstract

Inocybe caryicola, a new species associated with Carya illinoinensis and discovered in Yunnan province, China, is described based on morphological characteristics and phylogenetic analyses. Inocybe caryicola is distinctly characterized by the pileus of young basidiomata with an obvious cortina, relatively small basidiospores that are angular to polygonal and have 11–13 distinct nodules, 2- or 4-spored basidia, and the presence of subclavate cauloparacystidia. This study provides a detailed description of the new species, photographs of the basidiomata, as well as microscopic images of the basidiospores under light microscopy (LM) and basidiospores under scanning electron microscopy (SEM). Molecular phylogenetic analyses based on ITS, LSU, and rpb2 show that Inocybe caryicola forms a highly supported clade, which is sister to the clade jointly formed by I. chondrospora and I. kuberae.

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