Pits And Middle Lamella

Figure 4.5 Fibers. A. A cross section of a portion of stem tissue from a linden tree (Tilia sp.), x1,000. Note the thickness of the walls of the darker fibers. B. A longitudinal section through fibers in a Welwitschia leaf, x1,000. (B. Photomicrograph by G. S. Ellmore)

Longitudinal Section Fibers PlantsMiddle Lamella

Figure 4.7 Pits. Pits are depressions or cavities in cell walls where the secondary wall does not form. There may be from one or two to several thousand in a cell. They always occur in pairs, with one on each side of the middle lamella. Some, called bordered pits, bulge out from the wall and resemble doughnuts in surface view, while others, called simple pits, do not bulge. (Inset from Sylvia S. Mader, Biology, 7th edition. © 2001 The McGraw-Hill Companies. All rights reserved.)

Figure 4.7 Pits. Pits are depressions or cavities in cell walls where the secondary wall does not form. There may be from one or two to several thousand in a cell. They always occur in pairs, with one on each side of the middle lamella. Some, called bordered pits, bulge out from the wall and resemble doughnuts in surface view, while others, called simple pits, do not bulge. (Inset from Sylvia S. Mader, Biology, 7th edition. © 2001 The McGraw-Hill Companies. All rights reserved.)

Tissues torus-

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Responses

  • richard
    Where does the middle lamella occur?
    8 years ago
  • edward
    What are the functions of pits and middle lamella?
    8 years ago
  • Ariam
    Where does middle lamella appar?
    7 years ago

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