Synonymy:
Zygohansenula californica Lodder, Centbl. Bakt. ParasitKde, Abt. II 86: 246 (1932)
Hansenula californica (Lodder) Wick., Tech. Bull. U.S. Dep. Agric. 1029: 39 (1951)
Zygowilliopsis californica (Lodder) Kudryavtsev [as 'californicus'], Bot. Mater. Otd. Sporov. Rast. Bot. Inst. Komarova Akad. Nauk S.S.S.R. 13: 146 (1960)

Hansenula californica var. maltosa Capr., Lantbr Högsk. Annlr 25: 185-220 (1959)

Endomycopsis fukushimae Soneda, Trans. Mycol. Soc. Japan 3: 36 (1962)
Zygowilliopsis californica var. fukushimae (Soneda) E.S. Naumova, Gazdiev & G.I. Naumov, Microbiology, Moscow 75(3): 304 (2006)

Pichia saturnospora Soneda, Trans. Mycol. Soc. Japan 3: 38 (1962)

Hansenula dimennae Wick., Mycopath. Mycol. appl. 37: 28 (1969)
Zygowilliopsis californica var. dimennae (Wick.) E.S. Naumova, Gazdiev & G.I. Naumov, Microbiology, Moscow 75(3): 304 (2006)

Position in classification:
Barnettozyma, Phaffomycetaceae, Phaffomycetales, Saccharomycetidae, Saccharomycetes, Ascomycota, Fungi

Note:
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