These fungi grow mostly on insect honeydew. Therefore they grow on any plant where enough honeydew accumulates. Often more than one fungus may intermingle on the same leaf.
Sooty mold fungi have black mycelium and grow on insect honeydew. The honeydew is excreted by certain types of scales and aphids. The thickness and black intensity can vary with the individual fungus as well as multiple fungi growing together.
As long as there is a sufficient amount of honey dew, sooty mold will grow - not only are plants affected but also cars, roofs, walls, patios and so on.
Manage most sooty molds by reducing the insects which produce the honeydew.