SYMBIOSIS: THE LICHENS

Biology in Action, 1966, John Tyler Bonner, Dodd, Mead & Co., New York.

Fig. 12.20 Diagrammatic sections through lichen. Left, ascus with spores, and hyphae below, showing ascomycete structure with green algae scattered among hyphae. Right, lichen tissue with fungal hyphae and green algae.