Plants: dark green to olive green. Stems: 1–3(–4) cm, not or weakly julaceous, innovations few; rhizoids few on proximal stem. Leaves: distant, somewhat contorted when dry, erect when moist, broadly ovate to suborbicular, concave, 0.5–2(–3.5) mm; base somewhat decurrent, red-green; margins plane or recurved proximally, 1-stratose, limbidium absent; apex broadly acute to obtuse; costa not reaching apex to rarely percurrent; proximal laminal cells rectangular, (60–)80–100 × 16–24 µm, 3–5:1, bulging, walls thin; distal cells irregular, 25–50 × 16–25 µm, 1–2(–3):1, walls thin. : Specialized asexual reproduction by rhizoidal tubers, on rhizoids at base of stem and in most proximal leaves, (200–)300–500 µm. Sexual: condition apparently dioicous. Sporophytes: unknown.
Wet soil, soil over rock, in streams. high elevations (2200 m). Ariz., Mexico, West Indies, Central America, South America.
Collections of Plagiobryoides renauldii were made in 2007 on the east side of the Chiricahua Mountains along a stream, occurring with P. incrassatolimbata. This is a robust aquatic species of Plagiobryoides similar overall to P. incrassatolimbata, but differing in the lack of a limbidium, the rounded apex, distant leaves, and rhizoidal tubers.