Pioppino mushrooms are most commonly known Black Popular or Sword Belt Agrocybe. Many know them by their Japanese name, Yanagi-matsutake. The pioppino mushroom is notorious for its smooth rounded cap and long white stem. The cap is yellowish-brown in color with gray gills that turn brown with spores. Typically, the pioppino will grow in clusters at the bottom of hardwood stumps Pioppinos are found in the wild right here in the USA around southern states such as Mississippi, Louisiana, and Georgia. They can also be found throughout the rest of the world in Southern Europe and Far East countries. The pioppino is not only known for its tatste and texture, it is also known for its medicinal and nutritional properties.