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Vascular Cryptogams Postlab


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Vascular Cryptogams Postlab

  1. 1. 2/17/2010 Vascular plants that do not produce seeds Spores only Vascular tissues: tracheids and sieve cells Post lab discussion‐98Theme.htm#Plantae:%20Pterophyta Description of Vascular Tissues which  Proto means first. develop from Procambium Everything inside the Endodermis hi i id h d d i 1
  2. 2. 2/17/2010 divided Amphiphloic Siphonostele has a pith in the center Concentric vascular bundles with an  Endodermis surrounding the bundle Leaf gap similar to the dictyostele but the bundles  collateral  lack an endodermis and are collateral or  bundles (closed  bicollateral (open type) type) distributed  in more that one  ring within the  Stem perforations no Endodermis erect stems as well as Stolons and  Division Psilotophyta Rhizomes Division Lycophyta – Selaginella and  pp y can be epiphytic Lycopodium d have Microphylls (leaves) and Roots Division Pterophyta– ferns Branching is Dichotomous for both organs Division Sphenophyta– horsetails or  Equisetum 2
  3. 3. 2/17/2010 3
  4. 4. 2/17/2010 Trabeculae ‐ cells of the endodermis ‐ highly elongated and span an air space Rhizomatous,  stolon Roots are  adventitious d Megaphyll predominate  organizational  pattern for fern  leaves is Pinnate. produced complex stelar organization in  some ferns Leafy stems have dissected steles while  f h di d l hil Rhizomes (produce few or no leaves) have  relatively undissected steles. No leaf gap with leaf gap starting to form 4
  5. 5. 2/17/2010 cortex endodermis xylem phloem Aerial Stems &  Rhizomes Grooved, Jointed Grooved  Jointed Microphyll, Whorled  Arrangement Hollow canals‐ Cells Destroyed by  Elongation Central canal Leaves are fused and form a  sheath around the stem at each  node.  The number of tips signifies the  number of leaves. 5
  6. 6. 2/17/2010 •Thick Walls Sclerenchyma (Ridges) •Cutenized Cortical  •Rough Surface = (Vallecular) Canals Silicon Collenchyma •(Nick name = Chlorenchyma Scouring Rush) Opposite the  caused by the  ridges destruction of  Protoxylem during  Stele: eustele S l   l Elongation l May serve for  conduction but not  efficient Endarch Tracheids, in some  vessels Sieve elements metaxylem l protoxylem 6