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CHAPTER 6 image, Cross link between primary and secondary plant body;…

- - - - Primary cell wall
      - Most common
      - numerous subtype
      - Thin primary wall
      - alive at maturity
      - Many functions
    - - Thickened primary walls
      - alive at maturity
      - plastic supports #
      - Orchids and Phelodendrons
      - Extra strength
    - - Secondary Wall present
      - dead at maturity
      - elastic support
      - tracheary elements
      - Water transport
      - Types
        
        Mechanical
        
        Non-conducting Sclerenchyma
        
        Sclereids
        
        Fibers
        
        tracheary
        
        Conducting Sclerenchyma
        
        tracheids
        
        vessel elements
  - - - Alternate
      - opposite
      - decussate
      - whorled
      - spiral
      - distichous
    - - Stolons
      - Bulbs
      - Corms
      - Rhizomes
      - Tubers
  - - - Epidermis
        
        Cutin
        
        Cuticle
        
        guard cell
        
        Stomatal pores
        
        Trichomes
      - Cortex
        
        Pith
        
        vascular bundle
        
        Glandular trichomes
      - Vascular tissue
        
        Xylem
        
        Phloem
        
        vessel elements
        
        Pit membrane
        
        perforation
        
        sieve cells
        
        sieve pores
        
        companion cells
        
        albuminous cells
      - Vascular bundles
        
        Primary xylem
        
        Pith
        
        Primary phloem
        
        tracheary element