Plants large to more often robust, to 6 cm tall, forming loose to dense tufts, dark green to reddish-brown. Stems erect, often connected by underground stolons, few to several branched by innovations. Leaves distally or interrupted with crowded rosettes of leaves, or leaves ± equally spaced, mostly erect to erect-spreading and ± crispate when dry, erect-spreading to wide-spreading when wet, oblong-obovate to oblong, often 10 mm or more long, to 5 mm wide, apex obtuse-acute and often apiculate, rarely acuminate, base usually short decurrent; margins distally plane, reflexed or recurved below, occasionally undulate, limbate, serrate, often sharply so, or serrulate; costae single, strong below and usually weak distally, short excurrent, in cross-section stereids usually poorly developed; upper and median cells rhomboidal to hexagonal, thin- to ± thick-walled, often weakly to strongly porose; basal cells long-rectangular; marginal border cells linear to linear-rhomboidal, 2-6 rows, ± thick-walled. Dioicous. Perichaetia lateral. Setae 1-2, elongate, 2-8 cm long, rather stout. Capsules horizontal to pendulous, urn long cylindrical or cylindrical-pyriform, curved, 4-6 mm long, neck short; opercula conic-apiculate, peristome double, exostome teeth 16, trabeculate, lightly papillose, endostome basal membrane low to high, segments perforate and keeled, cilia well developed, appendiculate. Calyptrae cucullate, smooth and naked. Spores lightly papillose.

Plantas grandes hasta más a menudo robustas, hasta 6 cm de alto, formando manojos laxos hasta densos, de color verde oscuro hasta pardo-rojizo. Tallos erectos, a menudo conectados por estolones subterráneos, poco a muy ramificados por innovaciones. Hojas agregadas distalmente o en rosetas interrumpidas, u hojas ± equidistantemente espaciadas, generalmente erectas hasta erecto-extendidas y ± crispas en seco, erecto-extendidas hasta ampliamente extendidas en húmedo, oblongo-obovadas hasta oblongas, a menudo 10 mm de largo o más, hasta 5 mm de ancho, ápices obtuso-agudos y a menudo apiculados, rara vez acuminados, bases generalmente corto-decurrentes; márgenes distalmente planos, reflexos o recurvados hacia la base, ocasionalmente undulados, limbadas, serrados, a menudo muy claramente, o serrulados; costa simple, fuerte en el envés y generalmente débil distalmente, corto-excurrente, en corte transversal generalmente estereidas poco desarrolladas; células superiores y mediales rómbicas hasta hexagonales, con paredes delgadas hasta ± gruesas, a menudo débil- hasta marcadamente porosas; células basales largo-rectangulares; márgenes con un borde de células lineales a lineo-romboidales, en 2-6 filas, con paredes ± gruesas. Dioicas. Periquecios laterales. Setas 1-2, alargadas, 2-8 cm de largo, bastante robustas. Cápsulas horizontales hasta péndulas, urna larga cilíndrica o cilíndrico-piriforme, curvadas, 4-6 mm de largo, cuello corto; opérculo cónico-apiculado, peristoma doble, exostoma con 16 dientes, trabeculados, finamente papilosos, membrana basal del endostoma baja o alta, segmentos perforados y carinados, cilios bien desarrollados, apendiculados. Caliptra cuculada, lisa y desnuda. Esporas finamente papilosas.

Keys modified from Ochi (1981).

1. Leaves not or indistinctly bordered … 2.

1. Leaves distinctly bordered … 3.

2. Plants mostly with a terminal rosette; leaves obovate-spathulate, not decurrent, margins not bordered, marginal and inner laminal cells smooth or weakly porose … R. roseum

2. Plants ± equally foliate, leaves obovate-oblong, distinctly decurrent, margins indistinctly bordered … R. perspinidens

3. Leaves distinctly decurrent, border denticulate with some teeth double, its cells with pitted walls … R. procerum

3. Leaves not decurrent, border serrate or denticulate with single teeth, its cells with scarcely pitted walls … 4.

4. Leaves oblong (leaves not rostulate) … R. roseodens

4. Leaves obovate or obovate-oblong … 5.

5. Leaves obovate-oblong, ±distantly spaced … R. beyrichianum

5. Leaves obovate, distinctly rostulate-tufted … 6.

6. Leaves distantly serrate or serrulate, border of homogeneously linear, scarcely thicker-walled cells in 4-6 rows, margins nearly plane … R. grandifolium

6. Leaves closely denticulate, border of heterogeneous, thicker-walled cells in 2-3 rows; margins distinctly revolute ... 7.

7. Leaves more than 10 mm long; margins denticulate … R. roseolum

7. Leaves less than 7 mm long; margins serrate … R. huillense