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A new species Phlebopus spongiosus was discovered during the surveys on the mycobiota in southem Vietnam.It was specialized by a peculiar sponge-like tissues filled hollow space in the tubes and dissepiment encloses the pores when basidiomata are immature.Sponge-like tissue was composed by pleurocystidia-like elements and dissepiment was composed by cheilocystidia.To investigate ectomycorrhiza (ECM) between this fungus and a host Citrus maxima (pomelo), plant roots collected from the orchard (in situ roots) and those co-cultured with the mycelium of P.spongiosus (in vitro roots) for 2 months were examined.