Macrocystis integrifolia is one of four species of kelp (large brown algae) in the genus Macrocystis which grows to about 6 metres (20 ft) long.
Deep brown color on flattened rhizomes which are profusely dichotomously branched. Each is attached by branched root-like structures coming out of the sides of the rhizomes. Slender main stipes (about 1 centimetre (0.39 in) wide to 30 metres (98 ft) long) come from the rhizome which is up to 0.1 metres (3.9 in) at the widest. Periodically 5 centimetres (2.0 in) wide and 35 centimetres (14 in) long flattened leaf-like branches derive from the stipe. They have furrowed surfaces and taper gradually, but then have an oval or rounded float where attached to the stipe. The blade-like branches have notched denticulate edges leading to the terminal blade at the tip of the stipe, which is separated by several smaller branches.[3]
It is found on intertidal rocks or shallow subtidal rocks along the Pacific coast of North America from British Columbia to California.[2][4][5] It prefers water about 7 metres (23 ft) to 10 metres (33 ft) deep and exposed to the open sea and normal salinities, yet sheltered from full wave action.[6]
Macrocystis integrifolia alternates heteromorphic phases from a macroscopic sporophyte to dioecious microscopic gametophytes.[5] It has been studied as a plant fertilizer, increasing bean yields up to 24% and chemical studies indicate presence of phytohormone-like substances.[7]
In 2009, a study determined that this and Macrocystis pyrifera may be the same species.[8]
Macrocystis integrifolia is one of four species of kelp (large brown algae) in the genus Macrocystis which grows to about 6 metres (20 ft) long.
