There are as many as a hundred types of household mold, and people usually identify them by color. Black mold and green mold are the ones that most commonly show up in houses. Black mold is infamous among homeowners, as one common type of it produces mycotoxins. Green molds can also cause adverse reactions to the respiratory system or to the skin.
The scientific names for the four most common household molds are stachybotrys atra (black mold) aspergillus (an allergenic), acremonium (toxic) and cladosporium (non-toxic).
Allergenic molds are, at first, only a nuisance to allergy-prone people, causing the same general symptoms as a pollen allergy. However, if ignored and left to grow, allergenic molds can sometimes turn toxic.
Mildew is a cousin of mold that appears in white patches and is the least invasive—it can be scrubbed away with typical cleaning products.