How are pteridophytes classified into sub groups?

1.	How are pteridophytes classified into sub groups?
Answer» ANSWER: But the discovery of pteridophytes (SEED BEARING ferns) broke down this artificial classification. In 1935, Sinnott introduced term Tracheophyta to include all vascular plants. Tracheophyta are further divided into four main groups : Psilopsida, LYCOPSIDA, Sphenopsida and Pteropsida.

Answer»

But the discovery of pteridophytes (SEED BEARING ferns) broke down this artificial classification. In 1935, Sinnott introduced term Tracheophyta to include all vascular plants. Tracheophyta are further divided into four main groups : Psilopsida, LYCOPSIDA, Sphenopsida and Pteropsida.

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How are pteridophytes classified into sub groups?​

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How are pteridophytes classified into sub groups?