Rhizopus moldsIndustrial tempeh is made with certain edible strains of Rhizopus oryzae or Rhizopus oligosporus. In Indonesia, where tempeh originated, homemade tempeh normally contains a mixtures of both Rhizopus oryzae and Rhizopus oligosporus strains, together with other bacteria. They make tempeh starter by incubating boiled soybeans in hibiscus leaves.
Below you can find some microscopic pictures of Rhizopus oryzae molds, used in our tempeh.
Rhyzopus oryzae grown on agar.
Mycelium of Rhyzopus oryzae on fresh tempeh.
Sporangia of Rhyzopus oryzae on overripe tempeh.