Figure 1.

The Ceratopteris richardii sporophyte. (A) A whole plant with reproductive (arrow) and vegetative leaves. The vegetative leaves are less dissected than reproductive leaves. All postembryonic roots are adventitious roots and originate at the base of each leaf. (Bar = 1 cm.) (B) Naked sporangia on the abaxial surface of a reproductive leaf. Part of the leaf margin was removed to show the sporangia. Most sporangia mature at the same time, but a few sporangia develop later than others (arrow). (Bar = 0.5 mm.)