Give Structure Of Leaf Of Polytrichum ?
Leaves have broad bases. Leaves in the upper portion are green. But the lower ones are brown. Each leaf has a broad, colourless sheathing leaf base and narrow distal limb. The mid-rib forms the major part of the leaf. These leaves possess extra photosynthetic tissue in the form of closely set vertical plates of green cells. These are known as lamellae. Green lamellae act as additional photosynthetic tissue.
