Kingdom Protista: Multicellular Algae Seaweeds- multicellular algae Lots of variety Complex structures Intricate reproductive strategies

Thallus The complete body of an alga, not differentiated into true leaves, stems or roots.

General Part of Seaweed Blades- leaf-like forms. Not true leaves. Photosynthetic Pneumatocysts- gas-filled bladders that keep the blades afloat

Stipe Holdfast Stem-like part. Connect the blades and pneumatocysts. Anchors- looks like roots but do not absorb water or nutrients like roots

Green Algae Phylum Chlorophyta Found in salt water (10%), fresh water and even land Chlorophyll is main pigment Can be planktonic or form filaments Common green algae is Ulva

Brown Algae Used in ice cream, salad dressings and puddings Phylum Phaeophyta Marine and cold waters Added yellow pigments make it look brown Algin- found in the cell walls Used in ice cream, salad dressings and puddings Emulsifier- keeps things mixed 3 types found in N.A. Fucus- rockweed Sargassum Kelp

Red Algae Phylum Rhodophyta Sources of Agar Contains carrageenan- Most abundant Red pigments hide cholorphyll Live in deep waters Red pigments capture sun’s energy in low light Sources of Agar Used to grow bacteria on Contains carrageenan- emulsifier