Algae common in sewage ponds

Algae in hot springs

Algal Mat

Benthic algae

Surface algae

Stream algae

Blue-green bacteria:Anabaena

Anabaena bloom in Darling River, Australia

Colonial blue-green

Dead algae on lake surface

Filamentous blue-green

Historic blue-green toxicity problems

Recent blue-green toxicity problems

Blue-green bacteria:Spirogyra

YUCK! Algal slime

Diatom under microscope

Scanning electron micrograph of diatom

Fungy: Biofilm photo

Fungy: Hyphomycete