Put a piece of wet filter paper on a pane of glass and cover the jar. Begin to examine after 24 hours. The zygospores may appear in 4 or 5 days. Zygorhynchus is another interesting relative of Rhizopus, readily distinguished by having suspensors of very unequal size. Saprolegnia - This is an aquatic mold, very common upon insects and algae.
Cultures are easily and quickly made.
Bring in a quart of water from any stagnant pond or ditch, and into the water throw a few flies. After 12 to 24 hours throw the water away, rinse the flies in clean water, and put then into tap water. The water must be changed every day to keep bacteria from ruining the culture. The larvae of ants or small pieces of boiled white of egg are sometimes better than flies. Sporangia may appear within 24 hours but may be a day later.