CELL TYPE CYTOPLASMIC FEATURES CELL WALL FEATURES 3-D GEOMETRY
Guard Cells

Occur in pairs

How they work

Student Image Dicot

Student Image Monocot

Nucleus

Vacuolated

Mitochondria

Chloroplasts

Abundant Starch grains

Primary cell wall of variable thickness

Thickest wall is adjacent to intercellular space (stomatal pore) between the two guard cells.  This wall is heavily cutinized and may be lignified.

Outer periclinal wall is typically  thick and is heavily cutinized and sometimes lignified.

The wall adjacent to the intercellular space and periclinal outer wall are covered with a cuticle and/or wax.

Paradermal Kidney shaped,

Bone shaped,

Polygonal

Longitudinal  Rectangular with longest axis in periclinal plane.

May be sunken below suface of Epidermis