What term describes long, stringy filaments of algae?

The term that describes long, stringy filaments of algae is filamentous algae. This type of algae is characterized by its growth form, where the cells form long, thin strands or filaments, often resulting in a tangled or mat-like appearance in aquatic environments. Filamentous algae can often be seen in freshwater ecosystems and may contribute to the overall biomass of the algae present in these water bodies. Unlike other types of algae mentioned, such as green algae, blue-green algae, or brown algae, which can have different structures and forms, filamentous algae specifically refers to the filamentous growth characteristic. This distinction helps in identifying and managing different algal types in aquatic pest control, making it crucial for understanding aquatic ecosystems.