... the shape is like belt and contains a lot of iodine and potassium. 2. Kelp shape: frond brown, ... shape, petiole thick short and cylindrical, the upper of petiole is blade with wide long ribbon shape. There ... shape only plays a role fixation, the part of the leaves called thallus. 3. Chemical composition: ... acid, vitamin(e)B1,B2,C,P and carotene, Iodine, potassium, calcium and so on inorganic salt. 4. ...