Rostrupomyces, a new genus to accommodate Xerocomus sisongkhramensis, and a new Hemileccinum species (Xerocomoideae, Boletaceae) from Thailand

Summary

This research describes a new genus and species of mushroom from Thailand. The study used both physical characteristics and DNA analysis to show that these mushrooms represent previously unknown types that needed formal scientific description. The findings impact everyday life in several ways: • Provides formal scientific classification for mushrooms that are already being collected and eaten by local people in Thailand • Improves our understanding of mushroom diversity in Southeast Asian forests • Helps document the relationship between these mushrooms and specific forest trees • Contributes to food security by formally documenting edible wild mushroom species • Aids conservation efforts by documenting the biodiversity of Thailand’s forests

Background

The subfamily Xerocomoideae in Boletaceae currently consists of 12 genera. A new genus Rostrupomyces is established to accommodate Xerocomus sisongkhramensis based on morphological and molecular evidence. The genus can be differentiated from other Boletaceae genera by having rugulose to subrugulose pileus surface, white pores when young becoming pale yellow in age, subscabrous stipe surface with scattered granulose squamules, white basal mycelium, unchanging color in any parts, yellowish brown spore print, and broadly ellipsoid to ellipsoid smooth basidiospores.

Objective

To establish a new genus Rostrupomyces to accommodate Xerocomus sisongkhramensis and describe a new species Hemileccinum inferius from Thailand based on morphological and molecular evidence.

Results

Phylogenetic analyses showed Xerocomus sisongkhramensis formed a highly supported monophyletic group sister to Rubinosporus, distinct from other Xerocomus species. This supported establishing the new genus Rostrupomyces. A new species, Hemileccinum inferius, was also described based on unique morphological features and molecular evidence.

Conclusion

The new genus Rostrupomyces and new species Hemileccinum inferius are well-supported additions to the Boletaceae family based on both morphological and molecular evidence. Rostrupomyces appears to be associated with Dipterocarpaceae trees in lowland forests of Thailand and is consumed as an edible mushroom by local people.
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