Stomata

 Each stoma consists of two similar cells called guard

cells (smaller than epidermal cells stoma consists of two similar cells called guard Each containing chloroplast and usually starch granules), parallel to one another and enclosing between them a

small lenticular or oval space called osteole.

The cell surrounding the stomata are different from the remaining epidermal cells and called subsidiary cells

:Types of stomata

1- Anomocytic:

the stomata is surrounded by cells resembling the other

epidermal cells varying in number having no special arrangement

2- Paracytic:

the stomata is surrounded by two subsidiary cells having their long axis parallel to the osteole

3- Diacytic:

the stomata is surrounded by two subsidiary cells having their long axis perpendicular to the osteole

4- Anisocytic:

the stomata is surrounded by three or four subsidiary cells, one of which is markedly smaller than the others