Leaf primordia

leaf primordia Young leaves, recently formed by the shoot apical meristem, located at the tip of a shoot.

(coal-ee-op-tile) [Gk. koleon, sheath + ptilon, feather]
The sheath enclosing the apical meristem and leaf primordia of a germinating monocot.
collagen ...

See also: Membrane, Trait, Trans, Character, Skin