Small portion of epidermis of the lower face of a White-Lily leaf, with stomata.
Why are the stomata, or pores of leaves, generally placed on their under surface?
All tree leaves have stomata, but all are not arranged in the same way and are not visible alike.
This difference may be accounted for by the closure of the stomata at night.
Examination of the surface of a mullein leaf shows us that the lower surface of the leaf is provided with stomata.
stomata on flanks of ridges only, and few motor-cells between (Fig. 23).
Nardus has some of the bands devoid of stomata, but abounding in short cells, whereas others (above) have stomata throughout.
There are other methods of demonstrating the movements of the stomata.
The capsule is similar to that of Anthoceros, but has no stomata, and the elaters have spirally thickened walls.
They are green and lustrous above and silver white below, the whiteness due to stomata on their undersides.
"orifice, small opening in an animal body," 1680s, Modern Latin, from Greek stoma (genitive stomatos) "mouth," from PIE root *stom-en-, denoting various body parts and orifices (cf. Avestan staman- "mouth" (of a dog), Hittite shtamar "mouth," Middle Breton staffn "mouth, jawbone," Cornish stefenic "palate"). Surgical sense is attested from 1937.
stoma sto·ma (stō'mə)
n. pl. sto·mas or sto·ma·ta (-mə-tə)
A minute opening or pore, as in the surface of a membrane.
A mouthlike opening, such as the oral cavity of a nematode.
A surgically constructed opening, especially one made in the abdominal wall to permit the passage of waste.
Plural stomata (stō'mə-tə)