Firstly, Pteridophytes are the vascular plants (plants having xylem and phloem ) that reproduces via spores . As they don't have flowers or seeds. They have leaves, roots, stem and sometimes trunks also.

The most common example is Fern. And Fronds are the largest species of Ferns, it can reach some 6 m of hight.

Examples :-

1. Ferns
2. Horsetails
3. Azolla
4. Ptreium
5. Salvinia

There are around 13,000 species of Pteridophytes.