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The branch of botany dealing with algae
Botany is the scientific study of plants. It is a branch of biology, that also includes the study of algae and fungi.
Phycology is the study of algae. Some engineers look at algae as a source of biomass for fuel. Amazingly there are over 2,000 types of algae.
algae are producers
An algologist is a person who studies algology - the branch of botany which deals with algae.