(Gr. pteris: kind of fern; phyton: plant) In traditional classification systems, a division of the plant kingdom that included ferns, horsetails, and clubmosses, i.e. the nonseed-bearing tracheophytes. These are now classified as separate phyla: Filicinophyta (ferns), Sphenophyta (horsetails), Lycophyta (clubmosses), and Psilophyta.
The Phylum Pteridophyta is further organized into finer groupings including:
- Subphylum (1): Pteridophytina
- Infraphylum (2): Filices · Lycophytae
- Class (3): Filicatae · Filicopsida · Lycopsida
- Species: ZipcodeZoo has pages for 497 species, subspecies, varieties, forms, and cultivars in the Phylum Pteridophyta.
Lycopodiopsida is a class of plants often loosely grouped as the fern allies. Traditionally the group included not only the clubmosses and firmosses, but also the spikemosses (Selaginella and relatives) and the quillworts (Isoetes and relatives). However, the latter are now usually separated off into a separate class, Isoetopsida. [more]
At least 66 species and subspecies belong to the Class Lycopsida.
More info about the Class Lycopsida may be found here.
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