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Cork Cambium

Phellogen cuts off cells on both sides. The outer cells differentiate into cork or phellem, while the inner cells differentiate into secondary cortex or phelloderm.

Phellogen, phellem, and phelloderm are collectively known as periderm

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When gametophytes grow upon the soil and form independent plants “Exosporic”
eg: Psilotum, Pteris, Lycopodium
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Classification of peteridophytes
PSILOPHYΤΑ (WISK FERNS)
Eg: Psilotum
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Classification of peteridophytes

II.LYCOPODOΡΗΥΤΑ (CLUB MOSSES)

Eg: Lycopodium, Selaginella
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Classification of peteridophytes

III.EQUISETOPHYTA (HORSE TAILS)

 Eg: Equisetum
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Classification of peteridophytes
IV.  Filicophyta(Ferns)
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IV. Gymnosperm
non-flowering plants
Naked seeds (fruits are not produced)
Heterosporous- life cycle
Better adaptation for land habitat