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Pseudocalliergon trifarium
The slender, ovate leaves that are not much longer the wide; indistinct, single costa; and gradually differentiated, but enlarged alar cells characterize this species. Calliergon species have longer leaves, Scorpidium species have falcate-secund leaves, and Calliergonella has abruptly differentiated inflated alar cells. Pseudocalliergon (Scorpidium) turgescens is more robust, has more loosely arranged imbricate leaves each with a tiny apiculus.
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| Habit | Single, mostly unbranched, terete, string-like plants growing among other species, especially Scorpidium scorpioides. |
| Stems | without enlarged epidermis. |
| Leaves | ovate to oblong-ovate, obtuse, concave, imbricate and spirally seriate, margins entire, costa single, extending ½ to 2/3 the leaf length. |
| Leaf Cells | long rhombic to elongate-oblong, with blunt ends, smooth. |
| Alar Cells | enlarged, hyaline to orange, forming large, decurrent, and gradually differentiated groups |
| Habitat | Usually found as individual stems among other mosses in extreme-rich fen carpets. Rarely found in pure patches in carpets of rich fens. |
| Common Associates | Usually found with Scorpidium species, especially S. scorpioides and S. revolvens, and in similar habitats as Meesia triquetra. |
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