Lenticels are a special opening from the old stem instead of stomata. This allows the diffusion of respiratory gases and photosynthesis. Lenticels do not close. They are always open.
| Lenticular | Stomatal |
| Lenticels are a special opening from the barks of the old stem instead of stomata. | Stomatal is the amount of transpiration from lenticel is certainly higher than cuticular transpiration, but much less than abdominal breathing. |