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Published In: Synopsis Hepaticarum 233. 1845. (Syn. Hepat.) Name publication detailView in Biodiversity Heritage Library

Project Name Data (Last Modified On 4/14/2012)
Acceptance : Accepted
Project Data     (Last Modified On 10/10/2017)
Plant Category: Hepatics
General Reference:
Tropicos Lookup Reference:

Notes     (Last Modified On 10/10/2017)
Notes: A neotropical genus of ca. species. Species are typically associated with the Amazon and montane forests. Micropterygium is easily recognized by the peculiar, folded leaves with keels, which is usually winged on the back. In some species, however, a wing is lacking; these species usually have very large underleaves. The rigid stems, usually little branched and leafless at the base, the small, ± thick-walled leaf cells and the presence of underleaves are further characteristic features of this genus. The underleaves are quite variable in size and sometimes show a gradual decrease in size from the base of the stem to the apex. The center of diversity of Micropterygium is in the Guayana Highland with about 10 endemic species.


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Plantas pequeñas a medianas, 0.5-2 mm de ancho, amarillo-verde claras a pardas, ascendentes desde un sistema de rizoma ramificado, irregularmente ramificadas. Ramas intercalares (laterales y ventrales), a menudo estoloniformes. Tallos con pared celular gruesa, parda, 1-2-capas de corteza rodeando la médula formada por células menores, con paredes delgadas. Hojas transversales o súcubas, línea de inserción extendiéndose hasta la línea media dorsal del tallo, orbiculares a lanceoladas, cóncavas a conduplicadas y carinadas con un ala conspicua en la mitad superior, el ala algunas veces reducida, ápices enteros o muy corto-bífidos, márgenes enteros o dentados; células pequeñas, 10-20 µm, generalmente con paredes gruesas, la superficie lisa o mamilosa, cutícula lisa o papilosa. Anfigastros presentes, menores a casi tan grandes como las hojas. DioicasGametoceos como en la familia. Adaptado o modificado de Gradstein en Gradstein et al. (2001). Traducción por Claudia Aldana (LPB).

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