Distinguishing fact from fiction, leading experts gathered to discuss the most recent scientific evidence on health effects of mold at the Annual Meeting of the American College of Allergy, Asthma and Immunology (ACAAI) in Anaheim. “Fungi, including molds, are spore-producing organisms that comprise some 25% of the earth\’s biomass and function as decomposers of organic material,” said Richard W. Weber, National Jewish Medicine & Research Center in Denver. “Only about 80 of the 1.5 million species of fungi are known to be allergenic.