This is one of several genera of "black yeasts", characterized by mostly slow-growing, black, pasty colonies. The spores are produced in great masses along the filaments and occur on short lateral branches or pegs. When the spores are released they leave minute roughened scars. Exophiala species are similar but the spores do not leave rough scars as in Aureobasidium. Black yeasts occur in many habitats; some species of Exophiala may even cause human disease. Holomorphs unknown. Ref: de Hoog and Hermanides-Nijhoff 1977