- - small openings in the underside of leaves
- - Openings in colonnade showing dull interior
- - Plant openings
- - Plant's epidermic openings
- - Mouthlike openings.
- - Leaf openings
- - Opening
- - Pore that controls gaseous exchange in leaves
- - Plant mouths
- - Leaf pores
- - Leaf apertures
- - Pores
- - Plant apertures
- - Plant pores
- - Insects' spiracles
- - Minute orifices, as in leaves.
- - Pores in leaves.
- - Breathing pores in plants.
- - Minute orifices in leaves.
- - Breathing pores.
- - Ostioles
- - Mouths
- - Pores for gaseous exchange on leaf surfaces
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