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Leucomiaceae Broth. Search in NYBG Virtual Herbarium Decrease font Increase font Restore font
 

Published In: Die Natürlichen Pflanzenfamilien I(3): 1095. 1908. (Nat. Pflanzenfam.) Name publication detailView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 9/12/2009)
Acceptance : Accepted
Project Data     (Last Modified On 5/18/2013)
General Reference:
Tropicos Lookup Reference:

Notes     (Last Modified On 5/18/2013)
Notes:
The Leucomiaceae contain three genera and about eight species largely associated with the tropics; in the Neotropics there are two genera and six species. The family is characterized by the ecostate leaves, large laminal cells and undifferentiated alar cells. The Leucomiaceae is placed in the Hookeriales. Philophyllum, apparently only found in tank bromeliads, was previously placed in the Leucomiacae but is now considered better assigned to the Pilotrichacace. While Philophyllum may be confused with the Leucomiacae due to the fact that some of the leaves are ecostate, the former usually has some leaves that are costate (short and forked) and exhibits a synonicous sexual condition (autoicous in Leucomiaceae).
 
Leucomiaceae contiene tres géneros y 10 especies asociadas con los trópicos; en el Neotrópico están presentes dos géneros y siete especies. La familia está asociada con Hookeriales. El género Philophyllum, previamente localizado en Leucomiacae, actualmente está en Pilotrichacace, puede ser encontrado en la amazonía de Bolivia. Este género, sólo ha sido encontrado hasta ahora en bromelias tipo tanque, se caracteriza por las hojas ecostadas o con costa (mezcladas generalmente en la misma planta) y condición sexual sinoica.

 

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Plants somewhat small to large and robust, forming thin to dense lax or soft mats, pale to dark green to yellowish brown. Stems creeping and spreading, irregularly pinnately branched; in cross-section cells uniform, large and thin-walled, central strand absent; pseudoparaphyllia and paraphyllia absent. Leaves crowded to somewhat distant, lanceolate to ovate-lanceolate, apex acuminate to setaceous, often decurved; margins plane, entire or weakly to sharply serrate distally, elimbate; costa none; cells rhomboidal, fusiform or linear, smooth, walls rather lax or firm; alar region undifferentiated. Gemmae absent or present. Autoicous. Perichaetia lateral, leaves slightly differentiated. Setae elongate, slender, smooth or roughened or weakly papillose below urn. Capsules inclined to horizontal, ovoid-cylindrical to oblong; exothecial cells collenchymatous or longitudinal walls thicker; stomata at urn base, superficial; annulus not differentiated; operculum conic-long rostrate, oblique; peristome double, exostome teeth 16, striate below, papillose distally, furrowed; endostome basal membrane high, segments 16, keeled and perforate, cilia absent or rudimentary (1-2). Calyptrae cucullate or rarely mitrate, naked or with a few hairs, smooth. Spores spherical, lightly papillose or smooth.

 

Plantas algo pequeñas hasta grandes y robustas, formando matas delgadas hasta densas laxas o suaves, pálidas hasta verde oscuras hasta pardo amarillentas. Tallos reptantes y patentes, ramificaciones irregularmente pinnadas; en corte transversal células uniformes, grandes y con paredes delgadas, cordón central ausente; pseudoparáfilos y paráfilos ausente. Hojas agregadas hasta algo distantes, lanceoladas hasta ovado-lanceoladas, ápices acuminados hasta setáceos, a menudo decurvados; márgenes planos, enteros o débil a fuertemente serrados en la región distal, elimbadas; costa ausente o corta y bifurcada; células rómbicas, fusiformes o lineales, lisas, paredes bastante laxas o firmes; región alar indiferenciada. Yemas ausentes o presentes. Dioicas o autoicas. Periquecios laterales, hojas escasamente diferenciadas. Setas alargadas, delgadas, lisas o rugosas o débilmente papilosas debajo de la urna. Cápsulas inclinadas hasta horizontales, ovoide-cilíndricas hasta oblongas; células exoteciales colenquimatosas o con las paredes longitudinales engrosadas; estomas en la base de la urna, superficiales; anillo no diferenciado; opérculo largo-cónico rostrado, oblicuo; peristoma doble, exostoma con 16 dientes, estriados en la porción inferior, papilosos distalmente, acanalados; membrana basal del endostoma alta, con 16 segmentos, carinados y perforados, (1-2) cilios ausentes o rudimentarios. Caliptra cuculada o rara vez mitrada, desnuda, con pocos pelos o lisa. Esporas esféricas, finamente papilosas o lisas.

 

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1. Leaf margins entire; humid lowland to low montane forest … Leucomium
1. Leaf margins weakly serrulate to sharply serrate; mid montane forest … Rhynchostegiopsis
 
1. Márgenes de las hojas enteros; tierras bajas húmedas hasta bosque montano bajo … Leucomium
1. Márgenes de las hojas débilmente serrulados hasta nítidamente serrados; bosque montano medio … Rhynchostegiopsis
 
 
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