1) Bark 2) Cork 3) Outer tissue of bark 1) Cork 
cork
[n] - (botany) outer tissue of bark
phellem 1. The outer bark of an oak, Quercus suber, of Mediterranean countries, used for making stoppers for bottles, floats, etc. 2. A cork oak; the tree itself. 3. Something made of cork. 4. A piece of cork, rubber, or the like used as a stopper, as for a bottle. 5. Fish angling: a small float to buoy up a fishing line or to indicate that a f...
noun (botany) outer tissue of bark; a protective layer of dead cells