why are pteridophytes called vascular cryptogams?

Pteridophyta are highly evolved group among crptogams and they are called as vascular crptogams because of the conduction tissues called vascular bundles.

Pteridophytes are vascular cryptogams which means they have vascular tissues such as xylem and phloem but they cannot produce flowers

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Xylem and Phloem first appeared in Pteridophytes , that is why they are called Vascular Cryptogams.
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They are the first vascular plant  having xylem and phloem 
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