Fungi Perfecti's newest postcard set features four scanning electron micrograhs of the mushroom life cycle. These 4 x 6", computer color-enhanced images depict mushroom spores and mycelium in varying stages of development, at magnifications from 500X to 5000X. Each postcard bears a descriptive caption on the back. FPÕs Micrograph Postcards are educational as well as visually stunning! Sold only as a set.