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Stem of gymnosperm is aerial.Stem of pteridophytes are mostly underground.Tree Ferns have long aerial stems but these are Pteridophytes. The real difference is that gymnosperms bear seeds pteridophytes are without seeds.
Selaginella and Dryopteris .
Pteridophytes or gymnosperms
Ferns belong to pteridophytes
equisetum
gymnosperms
yo yo
375 mya
ferns PTERIDOPHYTES
pteridophytes can crawled like a snake on the ground
Pteridophytes.
Gametophytes are green only in bryophytes and pteridophytes. This is to be photosynthetic.