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The genus Retiboletus in China.

Nian-Kai Zeng¹, Zhi-Qun Liang¹, Gang Wu²

¹College of Pharmacy, Hainan Medical University, Haikou 571199, China.

|January 8, 2016

Summary

This study reveals three new species and two new combinations within the Retiboletus genus in China, based on morphological and DNA analyses. It clarifies taxonomic confusion and explores the genus

Keywords:

biogeography boletes new taxa systematics taxonomy

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Area of Science:

Mycology
Systematics
Molecular Phylogenetics

Background:

The genus Retiboletus (Boletaceae, Boletales) is taxonomically complex, particularly in Asia.
Previous identifications of Retiboletus species in China require revision.

Purpose of the Study:

To investigate the diversity and phylogenetic relationships of Retiboletus species in China.
To provide a taxonomic revision of the genus Retiboletus in the region.
To clarify the identity of previously misidentified Retiboletus specimens.

Main Methods:

Morphological examination of fungal specimens.
DNA sequencing of nuclear ribosomal DNA internal transcribed spacer (ITS) and partial 28S regions.
DNA sequencing of the translation elongation factor 1-a gene (tef1a).
Phylogenetic analyses using obtained DNA sequences.

Main Results:

Six distinct lineages within Retiboletus were identified from Chinese collections.
Three new species and two new combinations are described.
Misidentifications of "R. ornatipes", "R. retipes", and "R. griseus" were corrected, revealing R. sinensis, R. kauffmanii, R. fuscus, and R. pseudogriseus.
A dichotomous key for all known Retiboletus taxa was developed.
Phylogenetic analysis partially resolved relationships within the genus.
Preliminary biogeographical analysis indicated close relationships between Asian and North/Central American taxa, but no shared species between continents.

Conclusions:

The study clarifies the taxonomy of Retiboletus in China, introducing new species and combinations.
Phylogenetic and biogeographical data suggest complex evolutionary connections between Asian and American Retiboletus populations.
Further research is needed to fully resolve phylogenetic uncertainties and biogeographical patterns.