Giant kelps (Macrocystis pyrifera) are the largest algae in the ocean, growing upward to more than 150 feet. Their forests harbor one of the most diverse ecosystems on the planet. This story ...

The kelps found along the British coastline reach up to three metres in height. But some of the tallest in the world are giant kelp (Macrocystis pyrifera), which can be found in places such as along ...