Many other microorganisms will be growing on the plates. Bacteria, yeast, molds, and other fungi can be found. Bacterial and yeast colonies are usually comparatively small, round, globular, and shiny looking. Some bacteria and yeasts will cause the agar to lighten, but will not turn the agar yellow. Some yeasts will actually absorb the bromophenol and turn blue.
Some colonies are very slimy and irregularly shaped.
Other fungi will appear as irregularly shaped and cottony colonies, but will not change the color of the agar medium to yellow. Most of the plate photographs were taken looking at the bottom of the plate. Each yellow area is one colony. The mycelial threads can be seen spreading from one source. The yellow areas are irregularly shaped.