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Published In: The Bryologist 53(2): 145. 1950. (Bryologist) Name publication detail

Project Name Data (Last Modified On 10/7/2009)
Acceptance : Accepted
Project Data     (Last Modified On 10/8/2017)
Plant Category: Mosses

Notes     (Last Modified On 10/8/2017)
Groutiella contains some 10-12 species confined to the Neotropics. The genus is present in the wet lowland to low montane forest in the tropical Andes; typically found on tree trunks, logs, and occasionally on rock. The bordered leaf margins are diagnostic for separating Groutiella from other genera of this family. Additional features are the spirally-twisted leaves, upper and lower laminal cells not conspicuously differentiated, papillose peristome reduced to a low membrane, and the naked, smooth or plicate, mitrate-campanulate calyptra. Several species of Macromitrium exhibit a single row of cells confined to the base, but these cells are distinctly enlarge or swollen from adjoining inner laminal cells, and are toothed or entire; additionally a few species of this genus exhibit a border confined to distal margins below the apex. Some of the species of Groutiella were originally described and placed in Macromitrium, later segregated and placed in Micromitrium Besch. and Craspedophyllum Grout, hom. illeg.
Groutiella contiene unas 10-12 especies confinadas al Neotrópico. En Bolivia cinco especies son reconocidas. La mayoría de nuestras especies se encuentran en tierras bajas, bosque amazónico y Chiquitano, extendiéndose escasamente en el bosque montano bajo o premontano de Yungas. Las hojas bordeadas representan un diagnóstico para diferenciar Groutiella de otros géneros de esta familia. Otras características adicionales incluyen las hojas torcidas en espiral, células superiores e inferiores de la lámina no conspicuamente diferenciadas, peristoma papiloso reducido a una membrana baja, y caliptra mitrada-campanulada, desnuda, lisa o plegada. Varias especies de Macromitrium exhiben una sola fila de células confinadas a la base, pero estas células están conspicuamente alargadas o engrosadas, diferenciándose de las células adyacentes internas de la lámina, dentadas o enteras; adicionalmente unas cuantas especies de este género exhiben un borde confinado a los márgenes distales debajo del ápice. Groutiella tomentosa (Hornsch.) Wijk & Margad. posee ápices de las hojas deciduos.
Status unknown: Micromitrium maracaibense Broth., Mitt. Inst. Allg. Bot. Hamburg 8: 405. 1931. Type: Venezuela. Maracaibo, von Jess.


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Plants somewhat small to medium sized, forming dense mats, dark green to blackish. Primary stems creeping; densely tomentose, rhizoids smooth to papillose. Secondary stems usually simple, erect and short; in cross-section outer 2-3 rows of cells small, thick-walled, inner cells larger, thick- to thin-walled, central strand absent. Leaves crispate or tortuose when dry, wide-spreading when wet, oblong-lingulate to oblong-lanceolate, smooth to rugose or undulate, often folded along costa, apex short-acuminate to acute or obtuse-rounded to mucronate; margins plane, entire or serrulate-dentate below; costae single, strong, subpercurrent to short excurrent; median cells quadrate-rounded to suboval and often oblate, smooth or mammillate-bulging; basal cells somewhat differentiated, oblong to short rectangular-rounded, thick- to thin-walled, weakly porose or not; margins distinctly bordered, from base to 1/3-3/4 lamina length, to 8 rows wide below, 1-2 rows distally, linear to short or long rectangular, smooth; insertion cells golden yellow. Dioicous. Perichaetia terminal; leaves usually undifferentiated. Setae elongate, stout, smooth, often twisted. Capsules erect, urn ovoid or obloid elongate, neck short; exothecial cells short, thick-walled, rim cells oval-elongate, often oblate; stomata at urn base, superficial; opercula long rostrate; peristome reduced or appearing absent, membrane low, papillose. Calyptrae mitrate-campanulate, plicate or smooth, distally roughened or not, base deeply lobed, naked. Spores spherical, smooth to densely papillose.
Plantas algo pequeñas hasta medianas, formando matas densas, verde oscuras hasta negruzcas. Tallos primarios reptantes; densamente tomentosos, rizoides lisos hasta papilosos. Tallos secundarios generalmente simples, erectos y cortos; en corte transversal 2-3 filas externas de células pequeñas con paredes gruesas, células internas mayores con paredes delgadas hasta engrosadas, sin cordón central. Hojas crispas o tortuosas en seco, ampliamente extendidas en húmedo, oblongo-liguladas hasta oblongo-lanceoladas, lisas hasta rugosas o unduladas, a menudo dobladas a lo largo de la costa, ápices corto-acuminados hasta agudos u obtuso-redondeados hasta mucronados; márgenes planos, enteros o serrulado-dentados en la región basal; costa simple, fuerte, subpercurrente hasta corto-excurrente; células mediales cuadrado-redondeadas hasta subovales y a menudo oblatas, lisas o abultado-mamilosas; células basales algo diferenciadas, oblongas hasta cortas redondo-rectangulares, paredes celulares delgadas hasta engrosadas, débilmente porosas o no; márgenes conspicuamente bordeados, desde la base hasta 1/3-3/4 de la longitud de la lámina, 8 filas de ancho en la base, 1-2 filas distalmente, lineales hasta corto- o largo-rectangulares, lisas; células de la inserción amarillas doradas. Dioicas. Periquecios terminales; hojas generalmente indiferenciadas. Setas alargadas, robustas, lisas, a menudo torcidas. Cápsulas erectas, urna ovoide u obloide alargada, cuello corto; células exoteciales cortas con paredes celulares gruesas, células del borde ovado-elongadas, a menudo oblatas; estomas en la base de la urna, superficiales; opérculo largo-rostrado; peristoma reducido o de apariencia ausente, membrana baja, papilosa. Caliptra mitrada-campanulada, plegada o lisa, distalmente rugosa o no, base profundamente lobada, desnuda. Esporas esféricas, lisas hasta densamente papilosas.

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1. Leaves abruptly linear from an oblong base, apices usually fragile and deciduous … G. tomentosa
1. Leaves oblong-lingulate, apices present, not fragile … 2.
2. Leaves strongly rugose-papillose; apices obtuse-emarginate … G. obtusa
2. Leaves smooth to weakly rugose, not papillose; apices mucronate to short acuminate or acute … 3.
3. Marginal leaf border2/3-3/4 lamina length from base … G. husnotii
3. Marginal leaf border 1/2or less lamina length from base … 4.
4. Leaf apices acute to short acuminate; lower marginal border to 1/2 lamina length … G. chimborazensis
4. Leaf apices obtuse-rounded, mucronate; lower marginal border ca. 1/3 lamina length … 5.
5. Costa subpercurrent; leaves short and broad (2.6: 1) … G. tumidula
5. Costa short excurrent; leaves long and narrow (3.3: 1) … G. apiculata
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