Brown Algae These can be brown or golden-brown when wet. Many become green when dry. For example, you may find green Egg Wrack on the seashore. The spores of brown algae can hide in protective coatings in dry weather.
	Brown algae can be microscopic or 100 metres long. Here are some examples of brown algae: Diatoms - These are microscopic, and have a glasslike cell wall. They can be found in freshwater, sea-water, or on soil. Kelps - these are the largest type of algae in the world. One type, Sargassum, forms huge floating masses in the middle of the Sargasso Sea.