Scolecobasidium tshawytschae (Scolecobasidium variable)
A slow-growing fungus that produces a gray, brown, olivaceous brown or blackish olive colony within twenty-one days, when incubated at 25oC (77oF). It has worldwide distribution and is common. It has been isolated from soil, desert soil, salt marshes, plants, compost, decaying leaves, and fish aquarium water. It is the cause of fish mycosis. There have not been any reports of human infections.