The sporophyte of kelp is light brownish yellow, resembling a broken banana leaf fan in shape.It can grow up to 2 meters high and be 50-100 millimeters wide.Clearly, it is divided into holdfasts, stipes, and blades.The holdfast consists of branched pseudoroots with slightly enlarged tips for attachment to rocky substrates; the stipe is slightly elongated and flat round with a slight elevation in the middle, bearing a central rib that extends from the base of the blade, forming feather-like lobes on both sides.There are many black spots on its surface, which are openings of mucilage glands.The internal structure is similar to that of seaweed. As the sporophyte's stipe grows, it forms overlapping, ear-shaped folds on both sides, and when mature, spore sacs appear on these sporophylls.Kelp's life cycle is similar to that of seaweed, showing alternation of generations; however, the sporophyte's growth period is shorter than that of seaweed, nearly one
