Characteristics: Allergenic, Pathogenic, and Toxigenic dependant on genus and species.
Description: It is often found in saprophytes (an organism that grows on and derives nourishment from dead or decaying matter) and other plant pathogens. It is found everywhere in nature. It is disseminated as a wet spore through forcible discharge during periods of high humidity or rain.
Allergen: it is poorly studied.
Toxigenic agent: it is dependent on the genus and species, but is known to produce many toxins.
Some of the common asexual fungi such as Penicillium and Aspergillus produce sexual forms under certain conditions; these are classified in the ascomycete group and given distinct names.