lenticel

One of the small, oval, rounded spots upon the stem or branch of a plant, from which the underlying tissues may protrude or roots may issue, either in the air, or more commonly when the stem or branch is covered with water or earth.

He raises his binocular telescope, bringing the birches near the shoreline into sharp relief, the eye-shaped lenticels in the pale bark seeming to stare back at him, as if following the train’s progress.

A small, lens-shaped gland on the underside of some leaves.