Meesia triqueta grows in small tufts or cushions. The plants, often large, are acrocarpous and dioicous. In color they are dark-green to grass-green above, occasionally red-brown below due to dense rhizoids. The plant's stems are not branched or little branched, pale-brown to yellow-brown, closely foliate, and 2–14 cm high. Its leaves are decurrent, squarrose (spreading) when moist, triangular to ovate to lanceolate, somewhat crispate (contorted), 2–3½ mm long, and tristichous (in three obvious ranks). The leaf margins are sharply serrate or denticulate to the base or nearly so, plane or sometimes recurved in the middle of the leaf. The costa is relatively narrow (less than 1/5 the width of the leaf base), subpercurrent to percurrent, gradually tapering at distal end. The leaf's apex is acute to acuminate (sharply pointed). The lamina is unistratose throughout. The perigonia of Meesia triqueta' are terminal in discoid heads. The seta is straight and smooth, brown to yellow-brown, and very long (4–10 cm). The capsule is asymmetrical, somewhat pyriform, 2¾–5½ mm long including the neck; the hypophysis (neck) is long (comprising up to ½ of capsule length), moderately well-defined, not much wrinkled when dry; the urn is oblong to short-cylindric, arcuate and asymmetric, brown to yellow-brown, up to 4 mm long, and when dry, wrinkled but not regularly sulcate. The operculum is short-conic; the endostome cilia are often rather well-developed. The plant's spores are finely papillose.
