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

Mostly aquatic, submerged plants, although a few inhabit wet ground that dries out in summer. Leaves in rosettes, quill-like, hollow, with tiny ligules on upper side of base. Base broadens out where it attaches to bulb-like rhizome, with sporangia below ligule, covered by a thin transparent membrane (velum). Heterosporous (i.e. having two types of spores).

About 150 species worldwide. Three species in Britain, two in Ireland.
Isoetes echinospora Spring Quillwort Isoetes echinospora thumbnail, link to I. echinospora page
Isoetes histrix Land Quillwort Isoetes histrix thumbnail, link to I. histrix page
Isoetes lacustris Quillwort Isoetes lacustris thumbnail, link to I. lacustris page
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