Cystofilobasidium intermedium sp. nov. and Cystofilobasidium alribaticum f.a. sp. nov., isolated from Mediterranean forest soils.

ABSTRACT

Multiple isolates belonging to the basidiomycetous genus Cystofilobasidium were obtained from forest soils in Serra da Arrábida Natural Park in Portugal. Phylogenetic analyses employing concatenated sequences of the D1/D2 domain and ITS region support the recognition of two novel species Cystofilobasidium alribaticum f.a., sp. nov. (type strain CBS 14164T = PYCC 6956T = DSM 101473T) and Cystofilobasidium intermedium sp. nov. (type strain CBS 14089T = PYCC 6856T = DSM 101474T). Whereas C. alribaticum f. a. sp. nov. does not form hyphae, even when different strains are crossed, C. intermedium sp. nov. is self-fertile and forms mycelium with teliospores that upon germination give rise to slender basidia. The most remarkable physiological trait of the two novel species is their ability to grow at 35 °C, a property not observed for remaining species of the genus.