I've been reading a fascinating book called Mycophilia by food writer and cookbook author Eugenia Bone. She stoked my interest in everything mushroom. I have been most interested in the symbiotic relationship between underground mycorrhizal fungi and photosynthetic plants above ground. Some fungi serve to remove and clean-up diseased and dying plants. Others have symbiotic relationships with specific plants they tend to. Their root systems get intertwined, the plants delivering sugars to the fungi, the fungi extracting minerals from the soil and delivering them to the roots of plants.
