Mold is a term applied to fungi [often Penicillium and Aspergillus species
that are individually very small, but collectivelly form visible "fuzz" on
rotting things]. Individual fungal structures are so small most can only be
seen with a microscope. Mushrooms and bracket fungi however make big
structures you can see easily.
These fungi, which include many other genera than the ones named above,
recycle materials of all types of plants and animals, including wood,
leaves, fruit, insects, and leather. This is a very important process as it
releases nutrients tied up in these materials so that other living
organisms can use these nutrients and this recycling removes debris of dead
plants and animals.
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