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Some Characters of Xylem Tissue in Cycads, And, the Bar of Sanio and Primordial Pit in the Gymnosperms (Classic Reprint) - Softcover
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Excerpt from Some Characters of Xylem Tissue in Cycads, And, the Bar of Sanio and Primordial Pit in the Gymnosperms
These spool-shaped bars, extending in radial series across the lumens of adjacent tracheids, have received considerable notice in literature, owing to the confusion which arose in some cases between them and bars of Sanio. They have not before been figured in the Cycads, but are present, as shown in fig. 8, a radial section of Dioon spinulosum stem. They contain a core or axis composed Of a substance which stains in the same way as the middle lamella of the cell. This core pierces the tangential secondary walls Of the tracheid and joins up with the middle lamella. These structures are present in higher forms, but their significance is not known. Since they connect with the primary wall, they must have been laid down before the beginning of secondary thickening.
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- PublisherForgotten Books
- Publication date2024
- ISBN 10 1334419043
- ISBN 13 9781334419041
- BindingPaperback
- LanguageEnglish
- Number of pages55
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Some Characters of Xylem Tissue in Cycads, And (Classic Reprint)
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Paperback. Condition: New. Print on Demand. This book presents a detailed analysis of certain anatomical features of Cycads, an ancient plant group with living species. The author examines the shape and arrangement of bordered pits in the woody tissue of Cycads. Historically, the form of these pits was believed to provide evidence of evolutionary relationships between different plant groups. However, the author argues that a survey of primitive forms such as Cycads is needed to understand the ancestral character of these pits. By studying Cycads, the author traces the development of bordered pits from scalariform pits, a more primitive type of pit found in early plants. The author also examines the significance of bars and rims of Sanio, structures associated with bordered pits. These structures were previously thought to be a defining characteristic of certain plant groups, but the author argues that they show a wide range of variation in Cycads and other gymnosperms, indicating a more complex evolutionary history. Ultimately, this book provides new insights into the evolution of vascular tissues in plants, and challenges previous assumptions about the significance of certain anatomical features in determining plant relationships. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item. Seller Inventory # 9781334419041_0
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Some Characters of Xylem Tissue in Cycads, And, the Bar of Sanio and Primordial Pit in the Gymnosperms Classic Reprint
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PAP. Condition: New. New Book. Shipped from UK. Established seller since 2000. Seller Inventory # LX-9781334419041
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Some Characters of Xylem Tissue in Cycads, And, the Bar of Sanio and Primordial Pit in the Gymnosperms Classic Reprint
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PAP. Condition: New. New Book. Shipped from UK. Established seller since 2000. Seller Inventory # LX-9781334419041
Quantity: 15 available