Which algae type can have a cottony texture?

Cladophora is known for its distinctive cottony texture. This filamentous green algae is often found in freshwater environments, and it forms dense mats that can create a fluffy appearance due to the branching filaments. These characteristics contribute to the perception of a cottony feel when the algae grows abundantly.

The other algae types do not share this same texture. Spirogira typically has long, spiraled filaments but lacks the density that gives Cladophora its cottony feel. Hydrodictyon, while also filamentous, is characterized by its net-like structure rather than a cottony texture. Pithophora resembles Cladophora but is often more gelatinous and less fluffy. Thus, Cladophora stands out as the algae type associated with a cottony texture.