These mushroom spore prints will have hundreds of thousands to millions of spores per spore print. The spores are printed on heavy duty aluminum foil. Spore prints size depends on the species chosen. Most spore prints come from wild organic mushrooms and some will come from lab cultivated mushrooms. Each species description will let you know if they wild or cultivated. Either way they are all organic, we do not use any pesticides with our mushoroms.