During phylogenetic analyses of hymenomycetous yeasts based on 18S rDNA sequences, we found that
Bullera armeniaca showed an extremely close phylogenetic relationship to
Cryptococcus hungaricus. The analyses of internal transcribed spacer (ITS) regions of the two yeasts and the phylogenetically related species,
Bullera aurantiaca and
Bullera crocea, showed that
B. armeniaca and
C. hungaricus had identical sequences, indicating that these were conspecific.
B. aurantiaca and
B. crocea also showed high sequence similarity, 97.1% for ITS1, 100% for ITS2, and 98.7% for overall ITS regions. A DNA-DNA reassociation experiment revealed that
B. armeniaca and
C. hungaricus were conspecific and
B. aurantiaca and
B. crocea were two distinct species. These species occurred at a phylogenetically different lineage from that of
Bulleromyces albus (anamorph:
Bullera alba, type species of
Bullera) and
Filobasidiella neoformans (anamorph:
Cryptococcus neoformans, neotype species of
Cryptococcus). Based on these results, we emend the genus
Dioszegia to include both ballistoconidium-forming and non-ballistoconidium-forming yeasts and redescribe the species
Dioszegia hungarica. B. aurantiaca and
B. crocea are also transferred to
Dioszegia as
Dioszegia aurantiaca comb. nov. and
Dioszegia crocea comb. nov.
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