Schizosaccharomyces pombe
The fungi have several unicellular species, such as baker's yeast ("Saccharomyces cerevisiae") and fission yeast ("Schizosaccharomyces pombe"). Some fungi, such as the pathogenic yeast "Candida albicans", can undergo phenotypic switching and grow as single cells in some environments, and filamentous hyphae in others.