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Ferns and Horsetails (Monilophytes)
Clubmosses and Quillworts (Lycophytes)

Rhizomes extensive, subterranean, creeping, scaleless, hairy. Fronds arising singly; blades 2-4 pinnate; sori almost continuous along margins of pinnules, enclosed by rolled-under leaf margin; margins of infertile leaves also rolled under.

Worldwide distribution; previously thought to be just one species; number of species and subspecies under active research. One species in Britain with at least one highly distinct subspecies.
Pteridium aquilinum Bracken Pteridium aquilinum thumbnail, link to P. aquilinum page
Pteridium aquilinum ssp. pinetorum Pinewood Bracken Pteridium aquilinum ssp. pinetorum thumbnail, link to P. aquilinum ssp. pinetorum page
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