Catapulting Tentacles in a Sticky Carnivorous Plant
(A) SEM micrographs of excised snap-tentacles. Left image: The bilateral symmetric tentacle is characterized by a gland raised above the terminal disc on the tentacle head. The gland does not produce mucilage. The hinge-zone is clearly visible. Right image: Fracture of adaxial epidermal cells in the hinge-zone (arrows) that presumably is due to local cell buckling caused by the compressive stresses acting on the adaxial side during the fast tentacle bending motion. (B) Transverse section of the hinge-zone, stained with toluidine. The abaxial epidermal cells are smaller than the adaxial epidermal cells. Both epidermis and parenchyma do not feature pronounced wall thickenings.