Morphological and phylogenetic evidence reveal two new Pseudohydnum (Auriculariales, Basidiomycota) species from Guangxi and Xizang, China

2026/04/24 by Xi Zhang, Hong-Min Zhou, Zhe-Hui Tu +2 · 1 voice
Agricultural and Biological Sciences · #Lichen and fungal ecology #Mycorrhizal Fungi and Plant Interactions #Plant Diversity and Evolution

paper · pdf · doi:10.3897/mycokeys.131.189424

openalex publication_date 2026/04/24 · openalex created_date 2026/04/25 · openalex updated_date 2026/07/02

Abstract

Pseudohydnum (Auriculariales) is characterized by gelatinous, hydnoid basidiomata and longitudinally septate basidia. Currently, 26 species and one subspecies are accepted worldwide with molecular evidence, including two new species described here. In this study, specimens from Guangxi, Xizang, and Jilin provinces, China, were examined using morphological and phylogenetic analyses based on ITS1–5.8S–ITS2–nLSU sequences. The phylogeny resolves the genus as a well-supported monophyletic group. Pseudohydnum umbrosum is newly recorded from China. Two new species are described and illustrated as P. fusiformis from Xizang, characterized by olivaceous buff to clay-pink basidiomata, association with Abies at high elevations (above 3200 m), and the presence of fusiform cystidia—a feature previously known only from P. cystidiatum within the genus; and P. rhododendri from Guangxi, characterized by shell-shaped basidiomata with a pale mouse-gray pileal surface, the presence of cystidioles, and growing on living Rhododendron . The discovery of these new taxa and the new record further highlight China as a significant diversity center for Pseudohydnum .

Citations

• Unroughing the cat’s tongue mushrooms: Four new species of <i>Pseudohydnum</i> from Brazil based on morphological and molecular phylogenetic evidence
• Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia
• A convolute diversity of the <i>Auriculariales</i> ( <i>Agaricomycetes</i> , <i>Basidiomycota</i> ) with sphaeropedunculate basidia
• MrBayes 3.2: Efficient Bayesian Phylogenetic Inference and Model Choice Across a Large Model Space
• Studies in phylogeny and divergence times of Irpicaceae and Meripilaceae (Polyporales, Basidiomycota), with an emphasis on Ceriporia and Meripilus including ten new species

Discussions

• The discovery of two new gelatinous fungus species, Pseudohydnum fusiformis and P. rhododendri, has been documented in China. Additionally, a new regional record for P. umbrosum was established, in [bsky, 4 points, 0 comments]

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