Explanation

Yeast:

• Specifically, Saccharomyces cerevisiae is a type of yeast commonly used in baking bread.
• It ferments the sugars in the dough, producing carbon dioxide gas that makes the bread rise.

Pilobolus:

• This is a genus of fungi known for its ability to grow on herbivore dung.
• It is not typically associated with bread.
  

Puccinia:

• This is a genus of fungi known as rusts, which are plant pathogens.
• They are not associated with bread.