Classification of Pteridophytes

Psilopsida

• The most ancient vascular plants are placed in this class. The plants in this class have many primitive characters.
• Plant body is very simple and does not show much differentiation.
• Most of them have become extinct. Only two living species, Psilotum and Tmesipteris, are now available.
• Their plant body is differentiated in to stem, scaly leaves and rhizoids.
• Only one living genus is present in this class:- Ps…

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Some Important Points About Pteridophytes

1. Selaginella:- Vivipary is present in it i.e.. partial endosporic germination.
   • Seed habit was originated in Selaginella like pteridophytes.
   • Ligulate leaves (tongue shaped) are present in it
   • Function – Ligule is secretory structure, which secret sporangium and the young leaf most.
2. In some pteridophytes sporangia are not formed on lower surface of sporophylls
3. In some pteridophytes sporangia are formed at the axil of leaf and example is Selaginella
4. In some pteridoph…

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