Photosynthetic, aquatic organisms in Chlorophyta.

Photosynthetic, aquatic organisms with rhodophytes.

Aquatic plants inhabiting ocean environments.

Marine photosynthetic multicellular seaweed group.

red algae in the order Corallinales.

Thread-like, photosynthetic aquatic organisms.

Microscopic organisms floating in water.

any of the various types of algal communities found in annual and multi-year sea, and terrestrial lake ice or glacier ice.

Harmful aquatic organisms producing toxins.

Rapid growth of aquatic algae.

Golden algae: Photosynthetic, unicellular aquatic organisms.

a group of freshwater micro-algae that grow in the alpine and polar regions of the Earth.

Brown algae resembling seaweed forms.