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Las Briofitas. Bolivia Ecologica 59
Micropterygium Lindenb., Nees & Gottsche Search in The Plant ListSearch in Index Nominum Genericorum (ING)Search in NYBG Virtual HerbariumSearch in JSTOR Plant ScienceSearch in SEINetSearch in African Plants Database at Geneva Botanical Garden Decrease font Increase font Restore font
 

Published In: Synopsis Hepaticarum 233. 1845. (Syn. Hepat.) Name publication detail
 

Project Name Data (Last Modified On 7/11/2010)
Acceptance : Accepted
Notes     (Last Modified On 3/30/2015)
general taxon notes:
A neotropical genus of 18-19 species. Three species recorded for Bolivia associated with the Amazon and Yungas 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.
 
Fulford, M.H. 1966. Micropterygium. Memoirs of the New York Botanical Garden 11(2): 261-274.

 

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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. Dioicas. Gametoceos como en la familia. Adaptado o modificado de Gradstein en Gradstein et al. (2001). Traducción por Claudia Aldana (LPB).
 

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1. Anfigastros progresivamente menores hacia el ápice del tallo … M. aff. pterygophyllum
1. Anfigastros conspicuos, tan ancho o más anchos que el tallo, decreciendo escasamente en tamaño hacia el ápice del tallo … 2.
2. Hojas ovado-truncadas a rectangulares, carinadas encima pero no conspicuamente dobladas; ápice de la hoja truncado o agudo; márgenes gruesamente serrado-dentados; anfigastros hasta 2 veces más largos que anchos … M. leiophyllum
2. Hojas dobladas o marcadamente carinadas en toda su longitud; ápice de la hoja redondeado; márgenes enteros … M. lechleri
 
1. Underleaves progressively smaller toward the stem tip … M. aff. pterygophyllum
1. Underleaves conspicuous, as broad or broader than the stem, scarely decreasing in size toward the stem tip … 2.
2. Leaves ovate-truncate to rectangular, keeled above but not conspicuously folded; leaf apex truncate or acute; margins coarsely serrate-dentate; underleaves to 2 time longer than wide … M. leiophyllum
2. Leaves folded or sharply keeled throughout their length; leaf apex rounded; margins entire …. M. lechleri
 
 
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