Algae
Algae are simple plants that lack roots, stems, leaves and a vascular system. Some algae are tiny, single-celled plants that cannot be seen with the naked eye. Others are multi-cellular and grow in clumps or slimy mats.
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Didymo
Didymosphenia geminataDidymo is a type of algae that forms dense mats at the bottom of freshwater streams. It is an invasive species.
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Sea Lettuce
Ulva lactucaSea lettuce is a type of algae that grows in thin, green, wavy-edged sheets. It can be found in shallow waters throughout most of the Chesapeake Bay.