kingdom Protoctista, Protoctista - in most modern classifications, replacement for the Protista; includes: Protozoa; Euglenophyta; Chlorophyta; Cryptophyta; Heterokontophyta; Rhodophyta; unicellular protists and their descendant multicellular organisms: regarded as distinct from plants and animals

Chlorophyceae, class Chlorophyceae - algae distinguished chiefly by having flagella and a clear green color, their chlorophyll being masked little if at all by other pigments

chlorophyte, green algae - algae that are clear green in color; often growing on wet ricks or damp wood or the surface of stagnant water

class Ulvophyceae, Ulvophyceae - alternative name for the class Chlorophyceae in some classifications

Charophyceae, class Charophyceae - in some classifications: contains only the order Charales

division - (biology) a group of organisms forming a subdivision of a larger category