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VASCULAR PLANTS

     An important advance in the conquest of land by plants was the evolution of vascular tissue which allowed water to be transported from the ground to tissues high above the ground.  The first vascular plants lacked leaves.

FOSSIL PLANT FOSSIL PLANT

Primitive Vascular Plants:

      There are only 1000 modern species of primitive vascular plants but their fossil relatives colonized terrestrial environments and were the ancestors of more advanced plants.  The first plants lacked leaves and performed photosynthesis in their stems. Later groups evolved leaves.  Today these early groups are represented by whisk ferns, horsetails, and clubmosses.

HORSETAILS:

HORSETAIL
HORSETAIL HORSETAIL
CLUBMOSS CLUBMOSS
CLUBMOSS CLUBMOSS