Pteridophytes
Utilize the Alternation of Generations life cycle. They do not produce seeds (seedless vascular plants). Sperm must swim from the antheridium to the archegonium. Also lack of vascular tissue in their hyphae or look root like.
Have leaves or fronds, roots as well as true stems. Tree ferns have full trunks. Examples include ferns, horsetails and club-mosses. Fronds in the largest species of ferns can reach some six metres in length, go wide not tall. |