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Topic: Meristematic


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In the News (Thu 31 Dec 09)

  
  Wood Structure
Some botanists prefer to use the term phellem for the corky bark layer because it develops from a special meristematic layer outside the phloem called the phellogen.
Xylem cells are alive when they are initially produced by the meristematic cambium, but when they actually become functioning water-conducting cells (tracheids and vessels), they lose their cell contents and become hollow, microscopic tubes with lignified walls.
The thick cork layer or phellem is produced by a special meristematic layer (outside of the cambium and phloem layers) called the phellogen.
waynesword.palomar.edu /trjuly99.htm   (3159 words)

  
 Algaebase: listing the world's algae   (Site not responding. Last check: 2007-11-02)
Most species with perennial sporophytes (2-18 years old) with a blade that is regenerated from the meristematic region between blade and stipe.
Blades entire without median fascia (section: Simplices) or with conspicious median fascia (section: Fasciatae), or blades incompletely or palmately divided into a number of segments (section: Digitatae).
Sporophyte consists of different tissues: the central medulla, the parenchymatous cortex and the outer meristoderm, which is both photosynthetic and meristematic.
www.algaebase.org /generadetail.lasso?genus_id=3   (937 words)

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