Links to genera Ferns and Horsetails (Monilophytes) Clubmosses and Quillworts (Lycophytes)
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| Isoetes | Quillworts
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.
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