Most pteridophytes are homosporous, producing one type of spore that germinates to produce a potentially bisexual gametophyte.
1989, Douglas E. Soltis, Pamela S. Soltis, “Chapter 12: Polyploidy, Breeding Systems, and Genetic Differentiation in Homosporous Pteridophytes”, in Douglas E. Soltis, Pamela S. Soltis, editors, Isozymes in Plant Biology, page 241