structure of the mushroom mycelium of a white champignon, agaricus bisporus, in soil

soil mycelium fungus mushroom white agaricus organic plant terrestrial fungal macro lab microbiology biology research laboratory science structure bisporus grain farming cereal boletus sowing germinating hypha cultivating food agriculture grunge decomposer growing mycorrhiza natural fungi nature rhizosphere mycorrhizae filaments gardening industry closeup garden thread spores symbiotic