Estudo anatômico do xilema secundário de Ephedra tweediana C. A. Meyer
The anatomical features of the secondary xylem of Ephedra tweediana C.A. Meyer are described. They are also furnished photomicrographs as well as quantitative data of its structure. The wood anatomy fits with the described in the literature to other species of the same genus. In the wood of Ephedra...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 1995 |
| País: | Brasil |
| Institución: | Universidade Federal de Santa Maria (UFSM) |
| Repositorio: | Revista Ciência e Natura (Online) |
| Idioma: | portugués |
| OAI Identifier: | oai:ojs.pkp.sfu.ca:article/26533 |
| Acceso en línea: | https://periodicos.ufsm.br/cienciaenatura/article/view/26533 |
| Access Level: | acceso abierto |
| Palabra clave: | Wood Anatomy Ephedra tweediana Chlamydospermae Gnetales. Anatomia da Madeira Chlamydosperme |
| Sumario: | The anatomical features of the secondary xylem of Ephedra tweediana C.A. Meyer are described. They are also furnished photomicrographs as well as quantitative data of its structure. The wood anatomy fits with the described in the literature to other species of the same genus. In the wood of Ephedra tweediana they are found real vessels and very tall rays, up to 8 cells wide. These features are common in the Angiosperm Dicotyledons but absent in the Gymnosperms, with the exception ofthe Chlamydospermae or Gnetales. Ephedra separates itself in this group by the presence of foraminate or "ephedroid" perforation plates. In the xylem anatomy of this south brazilian species, they must be also emphasized the presence of very short tracheids, provided with uniseriate bordered pits and the peculiar "stepped outline" of annual rings. |
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