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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 11/22/2009)
Acceptance : Accepted
Project Data     (Last Modified On 10/29/2017)
Plant Category: Moss

Notes     (Last Modified On 10/29/2017)
general taxon notes:
Thamnobryum contains ca. 40 species, distributed in tropical regions and moist temperate regions; three species in the Neotropics. In Bolivia a single species is recorded, Thamnobryum fasciculatum (Hedw.) I. Sastre in I. Sastre & W.R. Buck. The genus is characterized by the dull, dark green to blackish green plants, 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. En Bolivia una sola especie es registrada, Thamnobryum fasciculatum (Hedw.) I. Sastre en I. Sastre & W.R. Buck. 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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