What are the classification of pteridophytes?
Pteridophyta is classified into four main classes: Psilopsida They are the most primitive. The stem is photosynthetic and dichotomously branched. Rhizoids are present. Leaves are mostly absent. The sporophyte is homosporous synangium. Examples- Psilotum and Tmesipteris. Lycopsida They are commonly known as club moss. Well-differentiated plant body with adventitious root, stem, rhizophores and leaves. The sporophyte is homosporous or heterosporous. Examples- Selaginella, Lycopodium. Sphenopsida Commonly known as horsetail. Well-differentiated plant body with roots arising from nodes of the underground rhizome, stem and scaly leaves. Homosporous, sporangia are borne on strobili. Examples- Equisetum. Pteropsida Commonly known as a fern. Well-differentiated plant body with roots, stem and leaves. The sporophyte is homosporous or heterosporous. Antherozoids are multiflagellate. Examples- Pteris, Dryopteris, Adiantum
