Yeasts are eukaryotic micro-organisms classified in the kingdom Fungi, with about 1,500 species currently described;Kurtzman, C.P., Fell, J.W. 2006. "Yeast Systematics and Phylogeny—Implications of Molecular Identification Methods for Studies in Ecology.", Biodiversity and Ecophysiology of Yeasts, The Yeast Handbook, Springer. Retrieved January 7 2007. they dominate fungal diversity in the oceans. Most reproduce asexually by budding, although a few do so by binary fission. Yeasts are unicellular, although some species with yeast forms may become multicellular through the formation of a string of connected budding cells known as pseudohyphae, or false hyphae as seen in most molds. Yeast size can vary greatly depending on the species, typically measuring 3–4 µm in diameter, although some yeasts can reach over 40 µm.

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