In $Selaginella$,male gametes are

Which pteridophytes produce microsporophylls and megasporophylls?

Microphyllous leaves are produced in

The fern $Dryopteris$ is:

Mesarch xylem is common in

In some of the pteridophytes and gymnosperms,the sporophylls aggregate at the apices of the main stem or its branches to form definite compact structures. These compact structures are called: