Term of Air-Bladder

Term of Air-Bladder:

Swollen air-filled portion of thallus found in Fucales order of brown algae. Increases buoyancy and help in gaseous exchange. Also seen as air filled protuberance in pollen-grains or certain gymnosperms due to separation of the layers of exine e.g. in pollens of pinus. Air-bladder give characteristic appearance to the pollen and help in dispersal of pollen by wind.