Epithallium
Encyclopedia
The epithallium is a layer of many algae
which bears the majority of photosynthetic apparatus.
Algae
Algae are a large and diverse group of simple, typically autotrophic organisms, ranging from unicellular to multicellular forms, such as the giant kelps that grow to 65 meters in length. They are photosynthetic like plants, and "simple" because their tissues are not organized into the many...
which bears the majority of photosynthetic apparatus.