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Plagiomnium ellipticum
There are a number of species with which Plagiomnium ellipticum could be confused; a summary of these for peatland habitats follows with differentiating features noted (compare to those listed above for P. ellipticum). Plagiomnium medium: Decurrent leaves on the fertile stems, larger and darker in color; an upland and margin species. Rhizomnium pseudopunctatum (also R. gracile): Entire leaves. Pseudobryum cinclidioides: Irregular leaf cells longer than wide with nodose walls, with a very few inconspicuous marginal teeth – this is a sometimes common species of rich fen carpets in the northern boreal zone. Plagiomnium cuspidatum and Mnium spinulosum are upland species.
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| Habit | Prostrate to sometimes ascending, lime-green plants; when fertile with erect,fertile branches and arching, spreading sterile runners. |
| Stems | naked or with a few rhizoids. |
| Leaves | obovate to ovate-rounded, blunt or with a small apiculus, bordered by elongate cells, upper margins with a few to numerous small denticulations; costa strong, ending just below apex; leaves not or only very slightly decurrent. |
| Leaf Cells | hexagonal, somewhat longer near the costa, evenly thin-walled, marginal cells longer. |
| Alar Cells | not differentiated. |
| Habitat | Rich fens occurring in lawns and depressions in wooded fens and forested swamps; also in depressions in open fens. |
| Common Associates | In open fens associated with species of Hamatocaulis and Drepanocladus aduncus. |
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