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Dicranum Hedw. 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: Species Muscorum Frondosorum 126. 1801. (Sp. Musc. Frond.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 10/1/2009)
Acceptance : Accepted
Notes     (Last Modified On 2/22/2013)
Notes:
Dicranum contains nearly 100 species distributed mostly in the cool temperate regions; about five species in the Neotropics. In the tropical Andes Dicranum is found from mid to high montane forest, extending into the humid shrubby páramo and puna; in shaded to partly exposed sites on soil or humus. Orthodicranum, considered a segregate genus or as a subgenus of Dicranum, is recognized in this treatment; see comments under the former name.
 
Dicranum tiene casi 100 especies distribuidas generalmente en regiones templadas frías; aproximadamente cinco especies en el Neotrópico. En Andes tropical hay dos especies, ambas asociadas con bosque montano, páramo y puna húmeda.
 
Excluded or doubtful taxa:
 
Dicranum deflexicaulon Müll. Hal., Linnaea 38: 589. 1874. Type: Colombia. Nova Granata, prov. Antioquia, Paramo de Sonson, 10-12,000 pedes altum, cum Dicrano flaccidissimo in locis paludosis associatum: G. Wallis 1872. Apparently a species of Chorisodontium (cf. Brotherus 1909: 328). The type described by Müller was likely destroyed during WW II.
 
Dicranum quitense Müll. Hal., Nuovo Giorn. Bot. Ital. n. s. 4: 32. 1897. Type: Ecuador? No data provided on location or collector, presumably from Ecuador. The identity unknown, possibly Chorisodontium (this species is described following Dicranum spectabile = Chorisodontium). Description states “differt statura robustiore, foliis majoribus quam maxime crispato-subulatis ad subulam asperulis atque theca cylindrica angusta.”
 
Dicranum scoparium Hedw. Reported from Venezuela, this common Northern Hemisphere species is excluded from the tropical Andes.

 

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Plants rather large and often robust, forming loose or more commonly dense tufts, glossy light to dark green or golden-yellow or -brown. Stems erect, solitary or few branched by innovations; central strand present; tomentose, usually densely so, rhizoids whitish to dark rusty-red. Leaves erect to wide-spreading and flexuose, occasionally falcate-secund, ovate-short lanceolate to lanceolate-subulate, concave below, distally keeled or involute, apex narrowly long acuminate or acute, base short decurrent; margins entire or distal 1/2 serrate; costae single, ca. 1/5 or less base width, entire or distally toothed on back, in cross-section stereid bands above and below guide cells; lamina unistratose, upper cells oblong-linear, strongly porose, smooth; basal or insertion cells golden-yellow; alar region differentiated, cells enlarged, quadrate or short to ± long rectangular, golden-brown. Pseudoautoicous. Perigonia attached to tomentum. Perichaetia terminal; leaves convolute, usually differentiated from stem leaves. Setae often 2-3, elongate, smooth. Capsules erect or inclined and curved, urn cylindrical; opercula long rostrate, ca. equal to urn length; peristome single, teeth 16, vertically striate-papillose. Calyptrae cucullate, smooth and naked. Spores spherical, papillose.
 
Plantas bastante grandes y a menudo robustas, formando manojos laxos o más comúnmente densos, de color color verde brillante claro a oscuro o amarillo-dorado o -pardo. Tallos erectos, solitarios o poco ramificados por innovaciones; cordón central presente; tomentosos, por lo general muy densamente, rizoides blanquecinos a rojo-oxidados oscuros. Hojas erectas a ampliamente extendidas y flexuosas, ocasionalmente falcado-secundas, corto-ovadas lanceoladas a lanceolado-subuladas, cóncavas abajo, distalmente carinadas o involutas, ápices angostamente largo-acuminados o agudos, base corto-decurrente; márgenes enteros o 1/2 distal serrada; costa simple, ocupando aproximadamente 1/5 o menos del ancho de la base, entera o distalmente dentada en el envés, en corte transversal filas de estereidas encima y debajo de las células guía; lámina uniestratificada, células superiores oblongo-lineares, marcadamente porosas, lisas; células basales o de la inserción amarillo-doradas; región alar diferenciada, células agrandadas, cuadradas o corto- a ± largo-rectangulares, pardo-doradas. Pseudoautoicas. Perigonios unidos al tomento. Periquecios terminales; hojas convolutas, generalmente diferenciadas de las hojas del tallo. Setas a menudo 2-3, alargadas, lisas. Cápsulas erectas o inclinadas y curvadas, urna cilíndrica; opérculo largo rostrado, aproximadamente igual a la longitud de la urna; peristoma simple, con 16 dientes, verticalmente estriado-papiloso. Caliptra cuculada, lisa y desnuda. Esporas esféricas, papilosas.
 

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1. Leaves lanceolate-linear or -subulate, 10-14 mm long; margins serrate in distal half; capsules inclined and curved … D. frigidum
1. Leaves broadly ovate-short lanceolate, 6.5-8 mm long; margins entire; capsules erect … D. peruvianum
 
1. Hojas lanceolado-lineales o -subuladas, 10-14 mm de largo; márgenes serrados en la mitad distal; cápsulas inclinadas y curvadas … D. frigidum
1. Hojas anchamente corto-ovado lanceoladas, 6.5-8 mm de largo; márgenes enteros; cápsulas erectas … D. peruvianum
 
 
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