Estudo anatômico do xilema secundário de Ephedra tweediana C. A. Meyer
DOI:
https://doi.org/10.5902/2179460X26533Keywords:
Wood Anatomy, Ephedra tweediana, Chlamydospermae, Gnetales.Abstract
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.Downloads
References
BOUREAU, E. Bois hétéroxylé et évolution. Mém. Soe, Bot. France, 1960 : 41-49.
CABRERA, A.L. & ZARDINI, E.M. Manual de Ia Flora de los alrededores de Buenos Aires.Buenos Aires, ACME SAC.I, 1978. 755 p.
COPANT - COMISION PANAMERICANA DE NORMAS TECNICAS. Descripcion de Ias caracteristicas generales, rnacroscopicas y microscopicas. 30: 1-019, novembro, 1973.
DIMITRI, M.J. Enciclopedia Argentina de Agricultura y Jardineria. Buenos Aires, ACME, 1978. Tomo 1.651 p.
DUJARDIN, E.P. Eine neue holz-zellulosenfaerbung. Mikrokosmos, 53: 94, 1964.
FREUND, H. Handbuch der Mikroskopie in der Technik. Frankfurt, Umsham Verlag, 1970. 379 p.
GREGUSS, P. Identification of Living Gymnosperms on the Basis of Xylotomy. Budapest, Akadémiai Kiadó, 1955. 263 p.
LAWRENCE, G.H.M. Taxonomia das Plantas Vascu1ares. Lisboa, Fundação Calouste Gulbenkian, 1977. 854 p.
LOMBARDO, A Flora Arborea y Arborescente dei Uruguay. Montevideo, Concejo Departamental, 1964. 151 p.
MARCHIORI, J.N.C. Estudo anatômico da madeira de Acanthosyris spinescens (Mart. Et Eichl.) Gris. (Santalaceaev. Ciência e Natura, 7: 107-118, 1985.
MELCHIOR, H. & WERDERMANN, E. A. Engler's Syllabus der Pllanzenfamilien. Berlin, Gebrüder Borntraeger, 1954. Vol. I. 367 p.
RECORD, S.J. & HESS, R.W. Timbers of the New World. New Haven, Yale University Press, 1949. 640 p.
SAVROV, L.A. The wood anatomy of the Ephedra species of the U.S. S.R. Bot Z., 41(9): 1324- 1331, 1956.
SPORNE, K.R. The morphology of Gymnosperms. London, Hutchinson University Library, 1974. 216 p.
Downloads
Published
How to Cite
Issue
Section
License
To access the DECLARATION AND TRANSFER OF COPYRIGHT AUTHOR’S DECLARATION AND COPYRIGHT LICENSE click here.
Ethical Guidelines for Journal Publication
The Ciência e Natura journal is committed to ensuring ethics in publication and quality of articles.
Conformance to standards of ethical behavior is therefore expected of all parties involved: Authors, Editors, Reviewers, and the Publisher.
In particular,
Authors: Authors should present an objective discussion of the significance of research work as well as sufficient detail and references to permit others to replicate the experiments. Fraudulent or knowingly inaccurate statements constitute unethical behavior and are unacceptable. Review Articles should also be objective, comprehensive, and accurate accounts of the state of the art. The Authors should ensure that their work is entirely original works, and if the work and/or words of others have been used, this has been appropriately acknowledged. Plagiarism in all its forms constitutes unethical publishing behavior and is unacceptable. Submitting the same manuscript to more than one journal concurrently constitutes unethical publishing behavior and is unacceptable. Authors should not submit articles describing essentially the same research to more than one journal. The corresponding Author should ensure that there is a full consensus of all Co-authors in approving the final version of the paper and its submission for publication.
Editors: Editors should evaluate manuscripts exclusively on the basis of their academic merit. An Editor must not use unpublished information in the editor's own research without the express written consent of the Author. Editors should take reasonable responsive measures when ethical complaints have been presented concerning a submitted manuscript or published paper.
Reviewers: Any manuscripts received for review must be treated as confidential documents. Privileged information or ideas obtained through peer review must be kept confidential and not used for personal advantage. Reviewers should be conducted objectively, and observations should be formulated clearly with supporting arguments, so that Authors can use them for improving the paper. Any selected Reviewer who feels unqualified to review the research reported in a manuscript or knows that its prompt review will be impossible should notify the Editor and excuse himself from the review process. Reviewers should not consider manuscripts in which they have conflicts of interest resulting from competitive, collaborative, or other relationships or connections with any of the authors, companies, or institutions connected to the papers.
