Studies in Ferns
نویسندگان
چکیده
منابع مشابه
ترجمه بخشی از کتاب "critical readings in translation studies"
چکیده در دنیای پیچیده ی امروز، تغییرات زیادی در زندگی بشری در حال وقوع اند و شاهد رقابت های بسیار فشرده ی جوامع در دستیابی به فناوری برتر و قدرت بیشترهستیم. به نظر می رسد که فرد وجامعه مجبورند به طریقی در وضعیت خویش دگرگونی ایجاد کنند تا از قافله ی علم، فناوری، و پیشرفت عقب نمانند. رشته مطالعات ترجمه نیز از این قاعده مستثنا نیست. علی رغم وسعت روز افزون پژوهش در این حوزه و میان رشته ای بودن مطال...
How early ferns became trees.
A new anatomically preserved fern, discovered from the basalmost Carboniferous of Australia, shows a unique combination of very primitive anatomical characters (solid centrarch cauline protostele) with the elaboration of an original model of the arborescent habit. This plant possessed a false trunk composed of a repetitive branching system of very small stems, which established it as the oldest...
متن کاملTypes of Foliar Dichotomy in Living Ferns
LEAVES OF CERTAIN ferns are commonly cited as "primitive" on the general theory that they have retained dichotomy of the major vascular axes of the leaf from ancient psilophyte ancestors (Zimmermann, in Verdoorn, 1938; Lam, 1948). The present study suggests a re-interpretation to be based on comparisons with ordinary fern leaves, "pinnate" in the arrangement of their main veins. The term "folia...
متن کاملMaidenhair Ferns, Adiantum, are Indeed Monophyletic and Sister to Shoestring Ferns, Vittarioids (Pteridaceae)
Across the tree of life, molecular phylogenetic studies often reveal surprising relationships between taxa with radically different morphologies that have long obscured their close affiliations. A spectacular botanical example is Rafflesia, a holoparasite that produces the largest flowers in the world, but that evolved from tiny-flowered ancestors within the Euphorbiaceae. Outside of parasitic ...
متن کاملStudies on Pacific Ferns, Part IV The Pteridophyte Flora of Pitcairn Island
ALTHOUGH THE FERNS of southeastern Polynesia have been described in several papers, no separate list has previously been provided for Pitcairn Island. The present paper outlines the details of a collection made there by Mr. W . H. Lintott of the Botany Department of the University of Canterbury, and includ es mention of other collections where these were available. When the changes which have o...
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ژورنال
عنوان ژورنال: Botanical Gazette
سال: 1911
ISSN: 0006-8071
DOI: 10.1086/330602