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Hypnella (Müll. Hal.) A. Jaeger 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 GardenSearch in Flora do Brasil 2020Search in Reflora - Virtual HerbariumSearch in Living Collections Decrease font Increase font Restore font

Published In: Bericht über die Thätigkeit der St. Gallischen Naturwissenschaftlichen Gesellschaft 1875–76: 365. 1877. (Ber. Thätigk. St. Gallischen Naturwiss. Ges.) Name publication detail

Project Name Data (Last Modified On 10/5/2009)
Acceptance : Accepted
Project Data     (Last Modified On 10/8/2017)
Plant Category: Mosses
General Reference:
Tropicos Lookup Reference:

Notes     (Last Modified On 10/8/2017)
Hypnella is a neotropical genus of six species. In the tropical Andes found in wet lowland to upper montane forest; on soil, rock, leaf litter, occasionally epiphytic. Some authors have argued for the placement of this genus in the Sematophyllaceae (cf. Crosby et al., 1985), close to Taxithelium and Glossadelphus (= Phyllodon, Hypnaceae of this treatment).
Hypnella contiene seis especies confinadas al Neotrópico. En los Andes tropicales se encuentra en tierras bajas húmedas hasta bosque montano superior; sobre suelo, rocas, hojarasca, ocasionalmente epífito.
Status unknown: Hypnella sigmatelloides (Müll. Hal.) Broth., Nat. Pflanzenfam. 1(3): 950. 1907. Hookeria sigmatelloides Müll. Hal., Nuovo Giorn. Bot. Ital. n. s. 4: 134. 1897. Type: Bolivia. Prope Yungas, 4500 ped., 1885, Rusby. Apparently the type has not been located (cf. Crosby et al. 1985).


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Plants medium sized, forming mats, pale to dark green, yellowish-brown or red, usually rather dull, occasionally glaucous. Stems spreading, rarely subascending or pendulous, irregular to regularly pinnately branched; in cross-section hyalodermis present or outer 2-3 rows of cells small, rusty-red, inner cells large, hyaline, central strand absent. Leaves crowded, erect to erect-spreading, ovate-oblong to narrowly or broadly oblong, 0.5-1.7 mm long, concave, apex acute-apiculate and often recurved, or long piliferous; margins reflexed below, finely serrulate to denticulate; costae double, usually 2/3 lamina length, parallel or slightly diverging; median cells linear to linear-oblong, walls entire to weakly porose, pluripapillose, 3-6 simple or branched papillae in a row over cell lumen; basal cells larger, oblong-rectangular, porose or not; insertion cells often golden-red. Perichaetia lateral, leaves differentiated. Autoicous or dioicous. Setae elongate, to 30 mm long, often roughened or papillose distally. Capsules inclined to horizontal, urn obloid to cylindrical,0.5-3.0 mm long, annulus present as undifferentiated cells; opercula rostrate; peristome double, exostome teeth finely cross-striate, furrowed or finely papillose, hyaline bordered with median zig-zag line; endostome basal membrane somewhat low to high, segments smooth to finely papillose, keeled and weakly perforate, cilia absent. Calyptrae mitrate, smooth, base lobed. Spores spherical, lightly papillose.
Plantas medianas, formando matas, verde pálidas hasta oscuras, pardo-amarillentas o rojas, generalmente bastante opacas, ocasionalmente glaucas. Tallos patentes, rara vez subascendentes o péndulos, ramificaciones irregular hasta regularmente pinnadas; en corte transversal hialodermis presente o ausente con 2-3 filas externas de células pequeñas, rojo-oxidadas, células internas grandes, hialinas, sin cordón central. Hojas agregadas, erectas hasta erecto-extendidas, ovado-oblongas hasta angostamente o ampliamente oblongas, 0.5-1.7 mm de largo, cóncavas, ápices agudo-apiculados y a menudo recurvados, o largo-pilíferos; márgenes reflexos abajo, finamente serrulados hasta denticulados; costa doble, generalmente ocupando 2/3 de la longitud de la lámina, paralelas o escasamente divergentes; células mediales lineales hasta lineales-oblongas, paredes enteras hasta débilmente porosas, pluripapilosas, 3-6 papilas simples o ramificadas en una fila sobre el lumen celular; células basales mayores, oblongo-rectangulares, porosas o no; células de la inserción a menudo rojo-doradas. Periquecios laterales, hojas diferenciadas. Autoicas o dioicas. Setas alargadas, hasta 30 mm de largo, a menudo rugosas o papilosas distalmente. Cápsulas inclinadas hasta horizontales, urna obloide hasta cilíndrica, 0.5-3.0 mm de largo, anillo presente como células indiferenciadas; opérculo rostrado; peristoma doble, dientes del exostoma con estrías finamente cruzadas, acanalados o finamente papilosos, borde hialino con una línea media en zig-zag; membrana basal del endostoma algo baja hasta alta, segmentos lisos hasta finamente papilosos, carinados y débilmente perforados, cilios ausentes. Caliptra mitrada, lisa, base lobada. Esporas esféricas, finamente papilosas.

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1. Leaf apices piliferous to long acuminate … 2.
1. Leaf apices acute to obtuse … 4.
2. Leaf apex rounded, abruptly piliferous … H. pilifera
2. Leaf apex gradually long acuminate to filiform, rarely subpiliferous … 3.
3. Leaf costae smooth above; marginal leaf cells narrowly long fusiform … H. leptorrhyncha
3. Leaf costae serrate above; marginal leaf cells broadly short rectangular … H. ambrosia
4. Leaf papillae often multifid, leaves obtuse, not apiculate, 0.5-1.0 mm long; plants often glaucous, whitish-green; exostome furrowed; primarily in wet lowlands … H. pallescens
4. Leaf papillae simple, occasionally multifid; leaves subacute, apiculate, 1.0-1.2 mm long; plants dull, greenish-yellow to reddish-brown or golden; exostome with zigzag median line; premontane to montane … H. diversifolia
1. Apices foliares piliformes a largo acuminados … 2.
1. Apices foliares agudos a obtusos … 4.
2. Apice foliar redondeado, abruptamente piliforme … H. pilifera
2. Apice foliar gradualmente largo acuminado a filiforme, raramente subpiliforme … 3.
3. Costa de las hojas lisa arriba; células marginales de las hojas angostamente largo-fusiformes … H. leptorrhyncha
3. Costa de las hojas aserrada arriba; células marginales de las hojas anchamente corto rectangulares … H. ambrosia
4. Papilas de las hojas generalmente multífidas, hojas obtusas, no apiculadas, 0.5-1.0 mm de largo; plantas generalmente glaucas, verde-blanquecinas; exostoma sulcado; principalmente en tierras bajas húmedas … H. pallescens
4. Papilas de las hojas simples, ocasionalmente multífidas; hojas subagudas, apiculadas, 1.0-1.2 mm de largo; plantas opacas, amarillo-verdosas a pardo rojizas o doradas exostoma con linea medial en zig-zag; de áreas premontanas a montanas … H. diversifolia
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