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Fern allies)
Fern ally is a general term covering a somewhat diverse group of vascular plants that are not flowering plants and not true ferns. Like ferns, these plants reproduce by shedding spores to initiate an alternation of generations. There are three or four groups of plants considered to be fern allies. In various classification schemes, these may be grouped as classes or divisions within the plant kingdom. The more traditional classification scheme is as follows (here, the first three classes are the "fern allies"):
A more modern or newer classification scheme is:
Note that in either scheme, the basic subdivision of the fern allies is preserved, with the exception that the Ophioglossophyta (Ophioglossopsida), once thought to be true ferns, are now generally regarded by many to be a distinct group of fern allies.
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