Plants in soft, loose tufts, light to dark green or yellow-green. Stems 0.2-3.5 cm; radiculose. Stem leaves obovate to long-lanceolate; margins entire or serrate distally; apex obtuse, acute, or acuminate; costa ending in or before apex; proximal laminal cells rectangular; distal cells oblong-hexagonal. Sexual condition dioicous (autoicous in S. pensylvanicum). Seta 0.2-15.5 cm, flexuose or twisted. Capsule not cleistocarpous, red-, orange-, or yellow-brown, or orange-red, cylindric; hypophysis with color greatly differentiated from urn, , elongate, usually much larger, wider than urn; annulus absent; operculum conic to hemispheric, blunt to apiculate; peristome double; exostome teeth 16, sometimes connate, reflexed when dry, inflexed when moist, of 3 layers of cells. Calyptra conic-mitrate, small, reaching hypophysis, not constricted beyond base. Spores 7-13 µm, smooth.
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