Poems by Sylvia Plath and Kay Ryan take the peripheral status of the fungal kingdom as an invitation to consider the scientific knowns and unknowns, and cultural significance, of mushrooms. Microbial ecologist Serita Frey, chef Gabrielle Hamilton, plant pathologist Barry Pryor, health advocate Dr. Andrew Weil, writers Maria Popova and Maria Pinto, and journalist Frank Bruni join host Elisa New.