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 Definition are a group of seedless vascular plants that make up the class Pteropsida, closely allied to horsetails and whisk ferns, also considered to be ferns, with which form the division Pterophyta, that evolved in the Devonian period comprising about 12,000 species. [d] [e]

Somehow the reference box won't show up and I can't figure out why! Can somebody please help out. btw should they be put in the bibliography subpage, and if so how? Jasper Wubs 11:33, 17 November 2007 (CST)

Part of the problem was just putting <ref name=Baker> with nothing else in the field. I fixed it by adding the first section of the first Baker reference and closing it with </ref>. Not sure why but it fixed it. --Robert W King 12:03, 17 November 2007 (CST)