Stomata are pores in the epidermis regulated by guard cells.

• Link to image of a cross section of the epidermis of a Medicago Stem, with a view of a stoma with guard cells and with basal cells of the epidermis.

 

• Link to image of a face view of Setcreasea leaf epidermis with guard cells lining a stoma, and with basal epidermal cells.

 

• Link to a view of a stoma with guard cells from a hornwort, a non-vascular plant.

 

• View of pores in the dermis of Marchantia which are not stomata as they do not have guard cells.