The common bread mold plant (or Rhizopus fungus) reproduces by the method of [[1]].

The tiny spores of bread mould plants (or Rhizopus fungus) are almost always present in the air.

If we keep a moist slice of bread open aside for a few days, then the spores of bread mould plants present in the air settle on the moist slice of bread and germinate to form new bread mould plants by spore formation. 

The bread mould plants first look like a white cottony mass covering the bread slice but later on turn black.