Have you seen an rottne mandarin orange before? It started with a white spot then spread all over the whole orange with green and grayish mold. Mold is fungi. Fungi play important role in decomposition of organic remains on our planet. They can live on pretty much any substrate and infect living organisms.
Fungi can produce billions of spores. Fortunately, only tiny fractions of spores survive. If spore gets in the place with suitable conditions mold spore grow very fast and produce microscopic threads called hyphae which builds fungi body or mycelium. Mycelium soon starts producing more spores. Mycelium usually does’t have a color but spores can have very different colors – gray, orange, yellow, black, green, etc.
To do this project, you probably don’t have to do anything. Fungi are very easy to grow. If you wish, you can use other foods as well. Just leave the orange out in the room for a week or two. If it is already start to decompose, it might only take a few days. The easiest way to observe the mold’s Mycelium is to use a stereo microscope (or dissecting microscope). Just place the orange peel on the stage plate. If you would like to see the detail structure of a spore, you may have to use high power microscopes.
Some photos to share with you.