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Pteridophytes-The Telome theory

#pteridophytes #telometheory Telome theory was proposed by Walter Zimmermann (1930). According to this theory, all vascular plants evolved either directly or indirectly from a simple leafless Rhynia type ancestral form made up of sterile and fertile axes (the telomes). Evolutionary modification of its parts produce more advanced vascular plants. The telome is the single-nerved extreme portion (at base or apex) of the plant body from the tip to the next point of branching. Two types of telomes have been recognized on the basis of their function: Vegetative or sterile telomes: without sporangia and Fertile telomes: bear terminal sporangia. The telome grow and divides dichotomously, the new segments become new telomes Telomes may be grouped together in various ways to form more complex bodies Telome Truss or Syntelome: Phylloid Truss- Only sterile telomes Fertile Truss- Only Fertile telomes....