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Published In: Flora Brasiliensis 1(2): 50. 1840. (Fl. Bras.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 5/28/2012)
Acceptance : Accepted
Notes     (Last Modified On 11/10/2012)

Pterobryon contains about 5-6 species apparently with a pantropical distribution; two species in the Neotropics. Premontane to high montane forest in the Tropical Andes; epiphytic on trunks and branches of trees and treelets. The genus is distinguish by its stipitate, dendroid habit, strongly plicate, ovate-lanceolate leaves, serrulate margins, subpercurrent costa, cylindrical propagula nearly always present in axils of distal leaves, and immersed capsules. The identity of Pterobryon climacioides Herzog, nom. nud. recorded for Bolivia is unknown.


Pterobryon contiene aproximadamente 5-6 especies aparentemente con  distribución pantropical; dos especies en el Neotrópico. En Bolivia sólo una especie es reconocida, Pterobryon densum (Schwägr.) Hornsch. El género se distingue por su  hábito estipitado, dendroide, hojas marcadamente plegadas, ovado-lanceoladas, márgenes serrulados, costa subpercurrente, propágulos cilíndricos casi siempre presentes en las axilas de las hojas distales y cápsulas inmersas.


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Plants large, often robust, forming loose to dense dendroid tufts, glossy green to golden-brown. Primary stems forming stolons, wiry, leaves scale-like. Stipe naked or with closely appressed distal leaves. Secondary stem regularly to irregularly pinnately branched; in cross-section outer 3-4 rows of cells small (epidermal surface appearing faintly papillose), thick-walled, inner cells large, thin-walled, central strand absent; pseudoparaphyllia foliose. Secondary stem leaves ovate-short lanceolate, weakly to rather strongly plicate, apex short acuminate, base weak to strongly auriculate and decurrent; margins plane to weakly recurved below, distal 1/3-1/4 serrate, costae subpercurrent (ca. 7/8 lamina length); median cells fusiform-flexuose, smooth, weakly porose; insertion cells strongly porose, golden-brown. Branch leaves smaller, broadly to more commonly narrowly lanceolate, strongly plicate, usually 2 long and often1-2 short plications near base, rarely undulate, apex acute; margins plane above, recurved below, dentate to serrulate below, distally serrate; laminal cells weakly porose. Gemmae usually abundant in leaf axial of distal stem and branch tips, long cylindrical, smooth. Dioicous. Perichaetia lateral; leaves broadly elliptical, abruptly setaceous, equal to or slightly shorter than lamina length, costae excurrent, margins faintly serrulate. Setae very short, ca. 0.5 mm long. Capsules immersed, erect, urn broadly ovoid-elliptical; exothecial cells irregularly short rectangular- or subquadrate-rounded, thick-walled; stomata absent; opercula conic-short rostrate; peristome appearing single, teeth 16, smooth, yellow, incomplete hyaline furrows at base. Calyptrae short mitrate, naked and smooth. Spores spherical to irregularly ovoid, appearing lightly papillose.
Plantas grandes, a menudo robustas, hasta 7 cm de largo, formando manojos dendroides laxos hasta densos, verde brillantes a pardo-doradas. Tallos primarios formando estolones, alambrinos, hojas escuamiformes. Estípite desnudo o con hojas distales {closely} adpresas. Tallos secundarios regularmente a irregularmente pinnados; en corte transversal 3-4 filas externas de células pequeñas (superficie epidérmica de apariencia débilmente papilosa), paredes celulares gruesas, células internas grandes, con paredes delgadas, cordón central ausente; pseudoparafilos foliosos. Hojas de los tallos secundarios corto-ovadas, lanceoladas, con pliegues débiles a bastante marcados, ápices corto-acuminados, base débil a marcadamente auriculada y decurrente; márgenes planos a débilmente recurvados abajo, 1/3-1/4 distales serrados, costa subpercurrente; células mediales fusiforme-flexuosas, lisas, débilmente porosas; células de la inserción marcadamente porosas, pardo-doradas. Hojas de las ramas menores, ampliamente a más comúnmente angostamente lanceoladas, marcadamente plegadas, generalmente con 2 pliegues largos y often1-2 cortos cerca de la base, ápices agudos; márgenes planos arriba, recurvados abajo, dentados a serrulados abajo, distalmente serrados; células de la lámina débilmente porosas. Yemas generalmente abundantes en las axilas de las hojas de los tallos distales y extremos de las ramas, largo cilíndricas, lisas. Dioicas. Periquecios laterales; hojas ampliamente elípticas, abruptamente setáceas, iguales o escasamente más cortos que la longitud de la lámina, costa excurrente, márgenes débilmente serrulados. Setas muy cortas (ca. 1 mm de largo). Cápsulas inmersas, erectas, urna ampliamente ovoide-elíptica, ca. 2 mm de largo; células exoteciales irregularmente corto-rectangulares o subcuadrado-redondas, con paredes gruesas; estomas ausentes; opérculo corto-cónico, rostrado; peristoma de apariencia simple, con 16 dientes, lisos, amarillos, incompleto hialino surco en la base. Caliptra corto-mitrada, desnuda y lisa. Esporas esféricas a irregularmente ovoides, de apariencia finamente papilosa.

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1. Secondary stem leaves broadly lanceolate to ovate-lanceolate, 2.5-3.0(4) mm long, branch leaves spreading, stems observable … P. densum
1. Secondary stem leaves long lanceolate to linear-lanceolate, (5)6-7 mm long, branch leaves erect, stems hidden … P. excelsum
1. Hojas de los tallos secundarios anchamente lanceoladas a ovado-lanceoladas, 2.5-3.0(4) mm de largo, hojas de las ramas extendidas, tallos observables … P. densum
1. Hojas de los tallos secundarios largo lanceoladas a linear-lanceoladas, (5)6-7 mm de largo, hojas de las ramas erectas, tallos ocultos … P. excelsum
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