In this article we will discuss about the classification of pteridophyta.
i. Eusporangiate type, in which the sporangium develops from a group of superficial initials, e.g., Selaginella, Equisetum.
ii. Leptosporangiate type, in which the sporangium develops from a single initial, e.g., Marsilea.
a. Spores develop into a multicellular, gametophytic body called prothallus.
b. Two sex organs, i.e., antheridia and archegonia develop on the prothallus.
c. Fertilization takes place with the help of water, and results into the formation of a diploid zygote. It develops into a structure bearing roots, stem and leaves. This structure is called sporophyte.
d. Plants show clear alternation of generations.