NDLI: Secondary phloem anatomy of Cycadeoidea (Bennettitales).

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Secondary phloem anatomy of Cycadeoidea (Bennettitales).

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Ryberg, Patricia E. Taylor, Edith L. Taylor, Thomas N.
Description	Author Affiliation: Ryberg PE ( Department of Ecology and Evolutionary Biology and Biodiversity Research Center, University of Kansas, 1200 Sunnyside Avenue, Lawrence, Kansas 66045-7534 USA.)
Abstract	Secondary phloem anatomy of several species of Cycadeoidea is described from trunks in the Wieland Collection, Peabody Museum of Natural History. The trunks were collected from the Lakota Formation, Lower Cretaceous, Black Hills of South Dakota. Secondary phloem is extensively developed and consists of alternating, tangential bands of fibers and sieve elements, with rare phloem parenchyma. Uniseriate rays, 2-22 cells high, occur between every one to three files of the axial system. Fibers are long, more than 1200 µm, approximately 26.6-34.2 µm in diameter, and have slit-like apertures on the lateral walls. Sieve elements range from 16-25 µm in diameter and are up to 500 µm long. Elliptical sieve areas appear on both end and radial walls and measure 10 µm across; minute spots, which may represent sieve pores, are present within the sieve areas. Secondary phloem of North American Cycadeoidea is similar in organization (alternating tangential bands) and cell types (sieve cells, fibers, axial parenchyma) to that known in other extant and fossil cycadophytes and some seed ferns. The unusual pattern of cell types and thickness of secondary phloem is discussed in the context of plant habit, phloem efficiency, and potential phylogenetic importance.
File Format	HTM / HTML
ISSN	00029122
e-ISSN	15372197
Journal	American Journal of Botany
Issue Number	5
Volume Number	94
Language	English
Publisher	Botanical Society of America
Publisher Date	2007-05-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Plant Science Agriculture Science Botany
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science Ecology, Evolution, Behavior and Systematics

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