Adiantum obliquum Willd.
  • Sp. Pl., ed. 4 , 5: 429 (1810)


Cite taxon page as 'WFO (2022): Adiantum obliquum Willd. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0001109477. Accessed on: 05 Dec 2022'

General Information

17. Adiantum obliquum Willd., Sp. Pl. 5: 429 (1810). Lectotipo (designado por Lellinger, 1972): Venezuela, Bredemeyer s.n. (B-W-20067-1!).

Por B. Zimmer.

Terrestres; rizoma corto a largamente rastrero, las escamas 2-3.5 x 0.2-0.5 mm, largamente lanceoladas, dentadas, pardo-rojizo claro; hojas 30-62 cm, no enraizando en el ápice; pecíolo tan largo como la lámina o más largo que ella, escasamente escamoso; lámina 11-19 x 5-12 cm, largamente lanceolada, 1-pinnada, ocasionalmente 2-pinnada con un par de pinnas pinnadas basales más cortas, ambas superficies lustrosas, el envés con escamas piliformes, las bandas de idioblastos oblicuas, conspicuas sobre ambas superficies, el segmento terminal rómbico a lanceolado, oblicuo, a veces 1- o 2-lateralmente lobado; raquis persistentemente escamoso, las escamas angosta y largamente lanceoladas o piliformes, dentadas, ramificadas en la base; pinnas con 9-15 pares, 3-6.5 x 1-2.5(-3) cm, alternas, angostamente deltadas a lanceolado-oblongas, agudas a acuminadas, a veces obtusas, cortamente pediculadas a subsésiles, la base oblicua, acroscópicamente paralela al raquis, basiscópicamente cuneada, el pedículo hasta 0.3 cm, no articulado, su color oscuro extendido hacia la costa por sólo hasta 0.2 cm abaxialmente; costa inconspicua; nervaduras libres, visibles en ambas superficies, terminando en los dientes; márgenes estériles irregularmente serrados a biserrados; soros varios por segmento, en ambas superficies de los segmentos, corta a largamente lineares; indusio puberulento; esporas blanquecinas a crema. Selvas altas perennifolias, riberas sombreadas. T (Matuda 3325, MEXU); Ch (Breedlove 34143, MO); B (Whitefoord 1521, BM); G (von Türckheim 8633, F); H (Schipp 275, B); N (Stevens 19984, BM); CR (Holm e Iltis 658, MO); P ( Mori 6986, MO). 0-1200 m. (S. México, Mesoamérica, Colombia, Venezuela, Guayanas, Ecuador, Perú, Bolivia, Brasil, Antillas.)

Adiantum obliquum parece ser menos frecuente en Mesoamérica que la similar A. petiolatum. Algunos ejemplares, principalmente de Panamá, muestran las características usadas aquí para distinguir a A. obliquum de A. petiolatum de manera aún más clara que el propio ejemplar tipo de A. obliquum; pudiese resultar tras estudios subsecuentes, que se trate de una especie aparte. En Panamá, esta especie hibridiza con A. petiolatum (Lellinger, 1989). Todo el complejo requiere de una cuidadosa investigación biosistemática.

  • Provided by: [C].Flora Mesoamericana
    • Source: [
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    Adiantum obliquum Willd., Sp. Pl. 5(1): 429. 1810. Fig. 5 D.

    Rizoma cortamente rastrero, con escamas larga­mente lanceoladas, café-rojizas, enteras a denticu­ladas; hojas 20–60 cm de largo; pecíolo escamoso; lámina oblonga a oblongo-deltada, 1-pinnada u oca­sionalmente 2-pinnada proximalmente, glabra adaxialmente, escamosa abaxialmente, verde en ambas superficies; raquis persis­tentemente escamoso; pinnas 9–15 pares; últimos segmentos lanceolados a ovados, cortamente pedicula­dos a subsésiles, el color oscuro del pedículo pasando al segmento abaxialmente; en los segmentos estériles los nervios terminando en los márgenes irregularmente serrados a variadamente bi­serrados; soros 15–25 por segmento, indusios corta a larga­mente lineares en los márgenes acroscópico y basiscópico del segmento.

    Pluvioselvas y bosques húmedos; Atwood 4518, Stevens 19984; 0–500 m; México a Bolivia y Brasil, las Antillas. Shimek (1897: p. 142–145, t. 5, f. 5–11, t. 6, f. 1–5, 8, t. 7, f. 1–4, t. 8, f. 1–5) presentó un estudio de esta especie; desafortunadamente todo el material que hemos visto es una mezcla de Adiantum latifolium y A. petiolatum. LC

  • Provided by: [E].Flora de Nicaragua
    • Source: [
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    Rhizome short-creeping, 2-4 mm diam.; rhizome scales lustrous yellow-brown, denticulate, lanceolate, 2.5-3.0 mm long, 0.5 mm wide, margin with short teeth; fronds clumped, 25-45 cm long, 7-10 cm wide; stipe ca. ½ the frond length, black, lustrous, glabrous with rare pectinate scales (to 2 mm long); blade oblong to oblong-deltate, pinnate with 6-9 pairs of pinnae, terminal pinnule conform, the basal pinnae often largest, short-stalked, inequilateral; rachis with dense, pectinate scales; largest pinnules 35-40 mm long, with apex long-acuminate, base oblique, margin finely denticulate to unevenly biserrate, midvein close to middle of pinnule, upper surface glabrous, with idioblasts, lower surface glabrous or with rare, pectinate, hairlike scales; sori several along both margins 1-6 mm long; indusium minutely denticulate, glabrous or with short hairs (0.1 mm long); spores whitish-cream.

  • Provided by: [B].Memoirs of the New York Botanical Garden
    • Source: [
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    Rhizomes short-creeping, 3–4 mm diam.; rhizome scales lustrous, castaneous, entire to denticulate, 2.5–3 x 0.5 mm, margins with short teeth; fronds clumped, 25–70 cm long, arching; stipes black, lustrous, to ca. 35 cm x 1–2.5 mm, ca. 1/2–2/3 the frond length, with numerous hairs and hair-like scales to 2 mm long; blades oblong to oblong-deltate, 1-pinnate (ours), occasionally the blades with a pair of 1-pinnate proximal pinnae smaller than the terminal part of the blades; rachises atropurpureous, with dense, tan, filiform, contorted scales and hairs; pinnae 6–12 pairs, ovate-lanceolate, proximal pinnae often largest, short-stalked to 5 mm, inequilateral, largest pinnae 3.5–7 x 1.5–2.5 cm, bases oblique, excised basiscopically, rounded acroscopically, apices acuminate, margins finely denticulate to unevenly biserrate, midveins close to middle of pinnae, nonarticulate; veins free, forking, ending in teeth; indument adaxially absent, abaxially of pectinate, hair-like scales to ca. 1 mm, not glaucous; idioblasts present on both blade surfaces; sori to ca. 20 along both acroscopic and distal portions of basiscopic margins; indusia 2–6 mm long, glabrous or often with numerous short hairs to ca. 0.3 mm long.

  • Provided by: [B].Memoirs of the New York Botanical Garden
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    Rhizomes creeping, covered with brown, shiny, denticulate scales 3 mm long. Fronds alternate, erect, 25-70 cm long, pinnate; petiole black, shiny, angular, 12-40 cm long, covered with dark-brown, ± caducous pubescence; rachis like petiole in color and pubescence; blade oblong to lanceolate, 10-30 X 7-15 cm; pinnae 8-13 on each side of rachis, dark green, subhastate, shortly petiolulate, unequal, with obliquely flabellate veins, terminal pinna present. Sori numerous, straight or subarcuate.

  • Provided by: [B].Memoirs of the New York Botanical Garden
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    Rhizome creeping, 3-4 mm thick, bearing (especially toward apex) numerous lustrous yellowish-brown, non-clathrate, distantly denticulate, linear- or narrowly deltate-attenuate scales mostly 3-4 mm long, often with hairlike tips. Fronds closely distichous, stiffly erect, 25-70 cm long; stipes 12-40 cm long, lustrous purple-black, angulate, deciduously clothed with minute brown, lax, unequally stellate hairs. Blades oblong to deltate-lanceolate, 10-30 cm long, 7-15 cm broad at base; rhachis like the stipe; pinnae 8-18 pairs and a subhastate terminal one, simple (or sometimes the lowermost pair somewhat elongate and pinnate), short-stalked, inequilateral, the simple ones mostly 1-2(-3) cm broad; fertile pinnae narrowly oblong-lanceolate or more or less deltate, evenly narrowed to the blunt or acutish apex, the base rounded-rectangular on acroscopic side, the basiscopic side excavate; veins obliquely ffabellate from a slender submedial costa; tissue papery, dark lustrous green, glabrate; sterile margins obscurely crenate and finely denticulate to unevenly bisenate the entire proximal part of basiscopic side. Sori several to many along both margins, discrete, nearly straight or subarcuate; indusial flap dark brown, minutely denticulate.

  • Provided by: [B].Memoirs of the New York Botanical Garden
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    Morphology

    Stem: rhizome short/creeping/nodose. Leaf: frond pinnate; rachis with scale/with hair; sterile margin biserrate; veins free; idioblast present; pinna or pinnule continuous/subsessile/dimidiate/on the both surface/with scale. Type of sporangium: leptosporangium pedicellate/glabrous. Sporangium: annulus vertical/with/indusium/glabrous/pubescent. Spore: trilete rugate/to/tuberculate.

  • Provided by: [D].Brazilian Flora 2020 project - Projeto Flora do Brasil 2020
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    • 1
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    Tallo: rizoma(s) corta(s)/rastrera(s)/nodoso(s). Hoja: fronde(s) pinada(s); raquis con escama(s)/con pelo(s); estéril(es) margen(es) biserrada(s); nervura(s) libre(s); idioblasto presente(s); pina o pínula(s) contínua(s)/subsésil(es)/dimidiado/en la(s) amba(s) superficie(s)/con escama(s). Tipo de esporangio: leptosporángio pedicelado(s)/glabro(s). Esporangio: ánulo vertical/con/indusio/glabro(s)/pubescente(s). Esporo: trilete arrugada(s)/à/tuberculada(s).

  • Provided by: [D].Brazilian Flora 2020 project - Projeto Flora do Brasil 2020
    • Source: [
    • 1
    • ]. 

    Caule: rizoma(s) curta(s)/rasteira(s)/nodoso(s). Folha: fronde(s) pinada(s); raque com escama(s)/com tricoma(s); estéril(eis) margem(ns) biserrada(s); nervura(s) livre(s); idioblasto presente(s); pina ou pínula(s) contínua(s)/subséssil(eis)/dimidiado/na(s) amba(s) superfície(s)/com escama(s). Tipo de esporângio: leptosporângio pedicelado(s)/glabro(s). Esporângio: ânulo vertical/com/indúsio/glabro(s)/pubescente(s). Esporo: trilete rugada(s)/à/tuberculada(s).

  • Provided by: [D].Brazilian Flora 2020 project - Projeto Flora do Brasil 2020
    • Source: [
    • 1
    • ]. 

    Distribution

    Terrestrial, in wet, lowland forests; Choapan, Juchitán, Pochutla, Tuxtepec, Villa Alta; 100-600 m. Mexico (Ver, Oax, Chis, Tab); Guat to Pan; WI, Trin, Tob; Ven & Col to Bol & Braz.

  • Provided by: [B].Memoirs of the New York Botanical Garden
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    Terrestrial in wet, tropical rain forests, lowland forests, calcareous soils; 100–600 m. Mexico; Guat, Bel, Nic, CR, Pan; Gr & L Ant; Col, Ven, Trin, Tob, Guy, Sur, Fr Gui, Ec, Peru, Braz, Bol.

  • Provided by: [B].Memoirs of the New York Botanical Garden
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    • 7
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    Rather common, on slopes in forest.

  • Provided by: [B].Memoirs of the New York Botanical Garden
    • Source: [
    • 8
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    Distribution Map

     
    • Native distribution
    Found in
    • Southern America Brazil Acre
    • Amapí
    • Amazonas
    • Parí
    • Rondônia
    • Roraima
    • Tocantins
    • Alagoas
    • Bahia
    • Ceará
    • Maranh
    • Pernambuco
    • Paraní
    • Espirito Santo
    • Minas Gerais
    • Rio de Janeiro
    • São Paulo
    • Mato Grosso

      Bibliography

     Information From

    MBG Floras Images
    http://www.tropicos.org/ImageSearch.aspx
    Flora images. Missouri Botanical Garden. Accessed on Jun. 2018.
    • A Missouri Botanical Garden
    Memoirs of the New York Botanical Garden
    https://www.nybg.org/
    Descriptions of plants should be attributed to the full citation for each individual article, chapter or book that is the source for each record, which should include the authors of original publication.
    • B Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
    Flora Mesoamericana
    http://www.mobot.org/MOBOT/fm/
    Gerrit Davidse, Mario Sousa Sánchez, A. O. Chater, Universidad Nacional Autónoma de México. Instituto de Biología, Missouri Botanical Garden, Natural History Museum (London, England) UNAM, 1994
    • C Missouri Botanical Garden
    Brazilian Flora 2020 project - Projeto Flora do Brasil 2020
    https://floradobrasil.jbrj.gov.br
    The Brazilian Flora Group (2018): Brazilian Flora 2020. http://dx.doi.org/10.1590/2175-7860201869402 Dataset/Checklist: https://ckan.jbrj.gov.br/dataset/thebrazilfloragroup_feb2018
    • D Group Brazil Flora, REFLORA Program
    Flora de Nicaragua
    http://www.tropicos.org/projectwebportal.aspx?projectid=7&pagename=Home&langid=66
    W. D. Stevens, C. Ulloa Ulloa, A. Pool & O. M. Montiel. 2001–. Flora de Nicaragua, Tropicos Project. Loaded from Tropicos Project: October 2017
    • E Missouri Botanical Garden
    Pteridaceae
    http://www.worldfloraonline.org/organisation/Pteridaceae
    World Flora Online Data. 2022.
    • F CC0 1.0 Universal (CC0 1.0).
    SynonymFamilies
    http://www.worldfloraonline.org/organisation/pseudo-TEN
    World Flora Online Data. 2022.
    • G CC0 1.0 Universal (CC0 1.0).
    World Flora Online Consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2017.
    • H CC0 1.0 Universal (CC0 1.0).