 Ascocarps come in multiple colors such as red, orange, yellow, brown, black, or, more rarely, green or blue.Some ascomyceous fungi, such as "Saccharomyces cerevisiae", grow as single-celled yeasts, which—during sexual reproduction—develop into an ascus, and do not form fruiting bodies.In lichenized species, the thallus of the fungus defines the shape of the symbiotic colony.