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Warnstorfia fluitans
Differentiated from other species with costate, falcate secund leaves by denticulate margins (best seen just below the apex), gradually differentiated alar cells that do not from conspicuous inflated groups, and a stem transverse section with a central strand. Drepanocladus aduncus has completely entire leaf margins, Warnstorfia exannulata has abruptly differentiated and inflated alar cells and a much stronger costa, while species of Hamatocaulis have no central strand in the stem. Species of Scorpidium have shorter leaves and a hyalodermis of enlarged cells. Also see comments under W. exannulata.
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| Habit | Floating to emergent rather slender, green plants |
| Stems | generally with a few branches, occasionally with numerous branches, with a central strand and no differentiate hyalodermis. |
| Leaves | narrowly lanceolate, gradually acuminate, falcate-secund, margins denticulate in upper portion of leaves, costa single, weak, ending about 1/2-2/3 up the leaf, somewhat narrowed to the insertion. |
| Leaf Cells | elongate-linear, with blunt ends, smooth. |
| Alar Cells | indistinct, gradually enlarged and forming a small groups of hyaline, rectangular cells at the leaf angles, |
| Habitat | Found floating in shallow pools to emergent and forming carpets in shallow water in oligotrophic habitats and characteristic of bogs and extreme poor fens. |
| Common Associates | In oceanic areas found with wet-growing species of Sphagnum, especially S. cuspidatum, while in continental areas associated with permafrost melt – there often with S. majus and S. jensenii. |
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