Stock photography, photos: Fungi on moss covered walnut tree Stock photos of Colony of mushrooms on the moss covered bark of an old walnut tree Photograph: © Ivan Butkovic Click for a larger image and more information Keywords associated with this stock photo: mushrooms,fungus,fungi,moss,green,parasite,parasitic,tree,tree bark,bark,woods,forest,walnut tree,walnut,nut,rough texture,texture,bark texture