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Published In: American Midland Naturalist 5(2): 50. 1917. (Amer. Midl. Naturalist) Name publication detailView in Biodiversity Heritage Library

Project Name Data (Last Modified On 9/27/2009)
Acceptance : Accepted
Project Data     (Last Modified On 11/8/2012)
General Reference:

Notes     (Last Modified On 11/8/2012)

Thamnobryum is stated to contain about 40 species, distributed in both the tropics and moist temperate regions; three species in the Neotropics. The genus is characterized by the dull, dark green to blackish green plants, strong, subpercurrent costa, and rhombic apical cells.


Thamnobryum contiene ca. unas 40 especies, distribuidas tanto en regiones tropicales y como regiones templadas húmedas; tres especie en el Neotrópico. Este género se caracteriza por las plantas verde pálidas, verde oscuras hasta verde negruzcas, costa fuerte, subpercurrente y células apicales rómbicas.


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Plants small to rather robust, 5-15(-20) cm tall, forming loose tufts, glossy dark green to blackish. Primary stems creeping, leaves scale-like, ovate-triangular, to ca. 1.5 mm long, often eroded from stem, radiculose. Secondary stems frondose, stipes mostly elongate, leaves ovate-subulate. Stem leaves loosely complanate, erect-spreading, ovate to ovate-lanceolate or oblong-ligulate, 2.5-4 mm long, to 1.2 mm wide, ± plicate when dry, ± concave, lateral leaves folded below, apex broadly acute, base undifferentiated to weakly auriculate; margins plane or slightly recurved at base, irregularly strong serrate in distal 1/4-1/3; costa single, subpercurrent, strong; apical cells rhomboidal-fusiform or short-hexagonal, thick-walled, smooth; median cells linear to oblong-rectangular; lower and basal cells irregularly long-rectangular. Branch leaves small, flagellate branches often present, leaves reduced, ligulate-acute, 1 mm long or less. Dioicous. Perichaetia leaves ovate-subulate. Setae elongate, to 20 mm long, smooth. Capsules horizontal, urn cylindrical, ca. 3 mm long, stomata base; opercula, conic-long rostrate; peristome, with exostome teeth cross-striate at base, becoming striate-papillose, distal 1/4 papillose; endostome papillose, basal membrane high, keeled and perforate, cilia present. Calyptrae unknown. Spores possibly papillose.


Plantas grandes hasta bastante robustas, hasta 9 cm de alto, formando manojos laxos alambrinos, bastante rígidos, verde brillantes oscuras hasta negruzcas. Tallos primarios reptantes; hojas escuamiformes, ovado-triangulares, hasta ca. 1.5 mm de largo, a menudo erosionadas desde el tallo, radiculosas. Tallos secundarios frondosos, estípites generalmente alargados, hojas ovado-subuladas. Hojas del tallo laxamente complanadas, erecto-extendidas, ovado- u oblongo-liguladas, 3-3.4 mm de largo, hasta 1.2 mm de ancho, algo plegadas en seco, ± cóncavas, hojas laterales plegadas abajo, ápices anchamente agudos, bases indiferenciadas hasta débilmente auriculadas; márgenes planos o escasamente recurvados en la base, fuerte e irregularmente serrados en 1/3 distales; costa simple, fuerte, ocupando ca. 3/4-4/5 de la longitud de la lámina; células de la lámina romboidal-fusiformes o -hexagonales, 20-40 µm de largo, 6-8 µm de ancho, pared celular gruesa, lisa; células inferiores y basales irregularmente elongado-rectangulares. Hojas de las ramas menores; ramas flageladas a menudo presentes, hojas reducidas, agudo-liguladas, 1 mm de largo o menores. Dioicas. [Periquecios laterales; hojas ovado-subuladas. Setas alargadas, hasta 20 mm de largo, lisas. Cápsulas horizontales, urna cilíndrica, ca. 3 mm de largo; estomas en la base de la urna, superficiales; opérculo largo-cónico rostrado; peristoma doble, exostoma con 16 dientes, estrías cruzadas abajo, distal 1/4 papiloso; endostoma papiloso, membrana basal alta, carinada y perforada, cilios presentes. Caliptra desconocida. Esporas esféricas, posiblemente papilosas.]


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1. Secondary stem and branch leaves ovate-ligulate; costae 40-60 µm wide at base … T. fasciculatum

1. Secondary stem and branch leaves ligulate to lingulate; costae to 160 µm wide at base … T. liesneri



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