August 7, 2025Open Access

Collybiopsis himalayensis sp. nov. (Omphalotaceae), a new white- spored agaric from the Indian Himalaya

Key Points

Collybiopsis himalayensis showcases distinct morphological traits, including a convex pileus and sub-ellipsoidal basidiospores.
The basidia range from 36-51.5 µm in length, supporting identification as a new taxon.
Phylogenetic analysis using nrITS sequences reinforces the classification of this new species.
Micro-morphological assessments reveal unique cystidia types, emphasizing biodiversity in the Indian Himalaya.

Abstract

A new species, Collybiopsis himalayensis, from the Uttarakhand Himalaya, India, is described based on micro-morphological and molecular phylogenetic analyses. This species is characterized by its convex to campanulate pileus with a slight umbo, margins uplifted, minutely pruniose surface, pale brown, sub-decurrent lamellae, sub-ellipsoidalbasidiospores, large basidia (36-51.5 × 6.6-7.9 µm), and presence of pleurocystidia and large hyphae like ileocystidia and cheilocystidia. Phylogenetic analyses of nrITS sequences confirm its categorization as a new taxon of Collybiopsis.

Collybiopsis himalayensis sp. nov. (Omphalotaceae), a new white- spored agaric from the Indian Himalaya

Key Points

Abstract

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