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1. Aplodon wormskioldii (Hornemann) R. Brown, Chlor. Melvill. 41. 1823.
Splachnum wormskioldii Hornemann in G. C. Oeder, Fl. Dan. 10(28): 8, plate 1659. 1819; Tayloria wormskioldii (Hornemann) Lindberg; Tetraplodon wormskioldii (Hornemann) Lindberg
Stems with branches often flagellate. Leaves shrunken when dry, erectopatent when moist, concave, 1-1.5 × 2-3 mm; costa sometimes 2-fid. Perichaetia terminal on axillary branches. Seta hyaline, very slender. Capsule 1.5-2 × 0.5-1 mm including hypophysis; columella included; exostome teeth of 2 layers of cells, short, truncate. Spores yellow-green.
Capsules mature summer. Dung, animal remains; low to moderate elevations; Greenland; Man., Nfld. and Labr. (Labr.), N.W.T., Nunavut, Que.; Alaska; n Eurasia.
Aplodon wormskioldii can be distinguished by the hyaline, slender and twisted seta. The gametophyte differs from other species of Splachnaceae in having shorter and much wider apical cells and a wider marginal row of laminal cells.
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