Macrocystis pyrifera is in the family Laminariaceae. Commonly known as giant kelp, it is found along the coasts of the Pacific Northwest, South America, and Australasia. It is a common misconception that giant kelp is a species of plant. In fact, it is a brown algae, very distantly related to plants and even green algae. However, giant kelp and other brown algae still have the capacity to photosynthesize due to an evolutionary event independent from rise of photosynthesis in plants. Giant kelp is the largest species of brown algae, and is even considered one of the fastest growing organisms on the planet. Giant kelp can form dense populations underwater known as kelp forests, which harbor hundreds of different species of aquatic life. Under the right conditions, giant kelp can grow up to 2 feet a day, reaching an ultimate height of over 150 feet tall.