Anatomía de seis especies de helechos del género Dryopteris (Dryopteridaceae) de México

Hernández, Victoria; Terrazas, Teresa; Ángeles, Guillermo

doi:10.15517/rbt.v54i4.3093

Cited by 4 publications

(5 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For example, in D. cinnamomea the C5 individual has 13 glands on the basal, 10 on the middle, and 7 on the apical blade, while the C14 individual presented 17 glands on the basal, 13 on the middle, and 20 toward the apical part. Hernández et al (2006) found some anatomical characters that support the species recognition. For example, there are crystals on the periphery of sclereid nests in the rhizome of D. rossii, while intercellular spaces in the sclereid nests distinguished D. patula.…”

Section: Discussionmentioning

confidence: 78%

The Dryopteris patula complex (Dryopteridaceae) in Mexico: morphometric analyses

2009

Self Cite

View full text Add to dashboard Cite

We studied collections from four species of the Dryopteris patula complex (D. cinnamomea, D. patula, D. rosea, and D. rossii) to identify the morphological characters that distinguish them from one another. D. maxonii and D. wallichiana were included as comparative species to evaluate characters that distinguish species within the complex. Quantitative characters were examined through principal component and canonical discriminant analyses, and both qualitative and quantitative characters were used to obtain phenograms. Multivariate analyses determined that basal pinna length, stipe scale length, number of pinna pairs, and frond length are the variables that discriminate among D. rossii and the other species of the complex. The phenogram showed two groups. One included D. maxonii and D. wallichiana, while the second grouped the four species of the complex. These species were distinguished by the shape and margin of their rhizome scales, color of stipe, and shape of the blade. A combination of morphological characters supports the recognition of the four species as valid. An identification key is given and a taxonomic treatment is presented for each of the taxa.

show abstract

Section: Discussionmentioning

confidence: 78%

The Dryopteris patula complex (Dryopteridaceae) in Mexico: morphometric analyses

2009

Self Cite

View full text Add to dashboard Cite

show abstract

“…Según estos autores, los patrones de vascularización con varios hacecillos de conducción, como las dictiostelas, están presentes en los linajes de helechos más derivados como es el caso de Dryopteridaceae (Schneider et al, 2004;Schuettpelz & Pryer, 2009;Liu et al, 2014), sugiriendo que la estructura del xilema (especialmente el aumento del número de cordones xilemáticos) estuvo bajo una fuerte presión de selección para resistir la sequía, durante la diversificación de los helechos Eupoliploides en el Cenozoico. Según Lin & DeVol (1977) el tipo más frecuente de configuración del cordón del xilema en las dictiostelas es el "hipocampo", término acuñado por Ogura (1972) en alusión a la forma típica del xilema con los dos extremos curvados (semejante a un caballito de mar) en transcorte; otros autores (Hernández et al, 2006;Pitterman et al, 2015) han aplicado el mismo término para Dryopteris y Polystichum, pero en estos géneros el xilema adopta una forma diferente, con un solo extremo delgado y curvo y el opuesto ancho y recto, por ello es denominado en este trabajo forma de "kitasato" (Fig. 3G).…”

Section: Clave Para Diferenciar Los Taxones De Polystichumunclassified

Anatomía comparada y análisis morfométrico en especies de Polystichum (Dryopteridaceae) del sur de Sudamérica

Morero

Giorgis

Barboza

2022

Bol. Soc. Argent. Bot.

View full text Add to dashboard Cite

Introducción y objetivos: Polystichum en Argentina y Chile, comprende 11 especiesoriginadas de los linajes: Sudamericano Austral y Andino. La taxonomía del géneroes conflictiva debido a la frecuente hibridación, asociada a patrones de especiación reticulada. El presente estudio tiene como objetivos: definir caracteres morfo-anatómicos que contribuyan a la diferenciación de los linajes y a la delimitación de nueve de los taxones que comprenden.M&M: Se realizaron mediciones exomorfológicas y análisis de la anatomía defrondes y rizomas de nueve especies de Polystichum (siete del clado AustralSudamericano y dos del Andino), usando microscopía óptica. En las especiesAustrales Sudamericanas se estudiaron 13 caracteres cuantitativos empleando 77especímenes de herbario, mediante análisis multivariados.Resultados: Los caracteres morfológicos que separan el clado SudamericanoAustral de Polystichum de las especies Andinas analizadas, son: los indusios, lasespínulas foliares y el margen de las escamas de rizomas y pecíolos. La formay división de la lámina, el número de pares de pinnas y la cantidad de ellas consoros, la longitud de las pinnas basales y características anatómicas como: pelosglandulares del indusio, banda circumendodermal y número de meristelas del pecíolo, son rasgos informativos a nivel específico del clado Sudamericano Austral.Conclusiones: Por primera vez, una combinación de atributos anatómicos,morfológicos y morfométricos han permitido separar de manera confiable los nueve Polystichum estudiados, demostrando su valor taxonómico.

show abstract

“…The sections were described according to Van Cotthem (1970), Ogura (1972), White (1974), Sen & Hennipman (1981) and Hernández et al (2006).…”

Section: Macroscopic and Microscopic Analysesmentioning

confidence: 99%

“…(Anemiaceae), linking it with adaptative strategies to hydric stress on rocky outcrop. The purpose of most comparative anatomic studies of ferns is to describe terrestrial species and to contribute to their taxonomic classification, as in the studies conducted by Hernández et al (2006) with species of Dryopteris Adans. (Dryopteridaceae) and by Hernández et al (2008) with species of Cheilanthes Sw. (Pteridaceae).…”

mentioning

confidence: 99%

Leaf dimorphism of Microgramma squamulosa (Polypodiaceae): a qualitative and quantitative analysis focusing on adaptations to epiphytism

Rocha

Droste

Gehlen

et al. 2013

RBT

View full text Add to dashboard Cite

Abstract:The epiphytic fern Microgramma squamulosa occurs in the Neotropics and shows dimorphic sterile and fertile leaves. The present study aimed to describe and compare qualitatively and quantitatively macroscopic and microscopic structural characteristics of the dimorphic leaves of M. squamulosa, to point more precisely those characteristics which may contribute to epiphytic adaptations. In June 2009, six isolated host trees covered by M. squamulosa were selected close to the edge of a semi-deciduous seasonal forest fragment in the municipality of Novo Hamburgo, State of Rio Grande do Sul, Brazil. Macroscopic and microscopic analyzes were performed from 192 samples for each leaf type, and permanent and semi-permanent slides were prepared. Sections were observed under light microscopy using image capture software to produce illustrations and scales, as well as to perform quantitative analyses. Fertile and sterile leaves had no qualitative structural differences, being hypostomatous and presenting uniseriate epidermis, homogeneous chlorenchyma, amphicribal vascular bundle, and hypodermis. The presence of hypodermal tissue and the occurrence of stomata at the abaxial face are typical characteristics of xeromorphic leaves. Sterile leaves showed significantly larger areas (14.80cm 2 ), higher sclerophylly index (0.13g/cm 2 ) and higher stomatal density (27.75stomata/mm 2 ) than fertile leaves. The higher sclerophylly index and the higher stomatal density observed in sterile leaves are features that make these leaves more xeromorphic, enhancing their efficiency to deal with limited water availability in the epiphytic environment, compared to fertile leaves. Rev. Biol. Trop. 61 (1): 291-299. Epub 2013 March 01.

show abstract

Anatomía de seis especies de helechos del género Dryopteris (Dryopteridaceae) de México

Cited by 4 publications

References 24 publications

The Dryopteris patula complex (Dryopteridaceae) in Mexico: morphometric analyses

The Dryopteris patula complex (Dryopteridaceae) in Mexico: morphometric analyses

Anatomía comparada y análisis morfométrico en especies de Polystichum (Dryopteridaceae) del sur de Sudamérica

Leaf dimorphism of <i>Microgramma squamulosa</i> (Polypodiaceae): a qualitative and quantitative analysis focusing on adaptations to epiphytism

Contact Info

Product

Resources

About