👉 Nectonema, also known as the "mushroom of the sea," is a type of fungus that grows on the surfaces of marine organisms. It has been recognized as an important part of the food chain in some ecosystems and can be found in various types of seaweed, such as kelp and mussels. Nectonema is characterized by its large, blackish-black cap that forms a protective covering over the surface of the mushroom. The cap is often covered with small,