Rubinosporus auriporus gen. et sp. nov. (Boletaceae: Xerocomoideae) from Tropical Forests of Thailand, Producing Unusual Dark Ruby Spore Deposits

Summary

Scientists have discovered a new genus and species of mushroom in Thailand’s tropical forests. This fungus, named Rubinosporus auriporus, is unique because it produces unusual dark ruby-colored spores, unlike its close relatives which typically produce olive-brown spores. The discovery adds to our understanding of fungal diversity in Southeast Asia and highlights how much remains to be discovered in tropical regions. Impacts on everyday life: – Contributes to understanding forest ecosystem health as these fungi form important partnerships with trees – Helps document biodiversity in threatened tropical forests – May lead to discovery of new beneficial compounds or properties – Demonstrates the importance of conservation efforts in tropical regions – Advances scientific knowledge of fungal diversity and evolution

Background

The family Boletaceae has been widely studied for over 100 years, with many new genera and species being recognized through modern molecular techniques and phylogenetic analyses. In the last five years, nine new Boletaceae genera have been described worldwide, with five from tropical to subtropical Asia where fungal diversity remains poorly known.

Objective

To describe and characterize a new genus and species of bolete fungus discovered in tropical forests of Thailand that produces distinctive dark ruby spore deposits, through morphological and molecular phylogenetic analysis.

Results

The analyses revealed a new genus Rubinosporus, with R. auriporus as the type species. The genus is unique among Xerocomoideae in producing dark ruby spore deposits and is characterized by: pileus surface with matted tomentum, stipe surface with scattered minute squamules, golden yellow thin tubular hymenophore, unchanging surfaces and context when bruised, and smooth broadly ellipsoid basidiospores. Phylogenetic analyses strongly supported Rubinosporus as monophyletic and placed it in subfamily Xerocomoideae.

Conclusion

Rubinosporus represents the tenth genus in subfamily Xerocomoideae and the third novel bolete genus described from Thailand. It is morphologically and phylogenetically distinct from other Boletaceae genera, particularly in its unusual dark ruby spore deposits. The genus likely forms ectomycorrhizal relationships with Dipterocarpaceae or Fagaceae trees, though further research is needed to confirm specific host associations.
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