Gi. Naumov et al., GENETIC AND MOLECULAR DELINEATION OF 3 SIBLING SPECIES IN THE HANSENULA-POLYMORPHA COMPLEX, Systematic and applied microbiology, 20(1), 1997, pp. 50-56
Genetic hybridization, molecular karyotyping and UP-PCR analysis showe
d chat the taxonomic complex Hansenula polymorpha DE MORAIS et MAIA co
nsists of three biological sibling species. H. angusta TEUNISSON et al
. (= Pichia angusta (TEUNISSON et al.) KURTZMAN) is not synonymous wit
h H. polymorpha and must be reinstated as a separate species. The thir
d sibling species is apparently a new taxon associated with Opuntia ca
cti. The sibling species are able to cross with each other but their i
nterspecific hybrids are sterile.