Bryum renauldii Röll ex Ren. & Card., Bull. Soc. Roy. Bot. Belgique 38(1): 221. 1899.
Protologue: Costa Rica. America centralis: Costarica, Sanchez prope San Jose, Sarg; herb. Röll (US).
Bryum obtusissimum Ren. & Card., Bull. Soc. Roy. Bot. Belgique 38(1): 222. 1899. Protologue: Costa Rica. America centralis: Costarica, Savanna prope San Jose, 4100 ped., in dejectu aquae Sarg; herb. Röll (US).
Hygrohypnum ellipticum Thér., Rev. Bryol. Lichénol. 9: 33. 1936. Protologue: Ecuador. Conocoto, dans un ruisseau, [Benoist] (n° 4.020) (synonymized by Ochyra, 1991).
Plants medium-sized, green to yellow‑brown in loose tufts to 2.5 cm high; rhizoids sparse. Leaves 1.5–2.5 mm long, distant, irregularly contorted when dry, spreading when wet, oval to suborbicular, weakly decurrent; apices obtuse to rounded; margins narrowly recurved below, not or faintly bordered above, entire or obscurely serrulate; costae subpercurrent, ending 2–4 cells below the apex; upper cells rhomboidal, thin but firm‑walled, 20–50 μm long, basal cells enlarged, bulging, rectangular, 40–90 μm long, thin‑walled, upper marginal cells rectangular, somewhat longer than the inner cells. Sexuality and sporophytes unknown.