Chrysophyta Approx. 10,000sp Unicellular Fresh & marine habitat Silica glass shells Benefits: photosynthetic Diatomaceous Earth Cleaners & filters Yellow or brown Ex. Diatoms

Dinoflagellata Approx. 1,100 sp Unicellular Cell wall composed of cellulose Most marine Contains orange and yellow pigments Ex. Fire algae Benefit: food chain

Euglenophyta Unicellular Approx 1000 sp No cell wall Green Most fresh water Ex. Euglena Benefits: producer

Chlorophyta Approx. 7,000 sp Unicellular, colonial, multicellular Green Cell wall made of cellulose Soil, rocks, trees, fresh water Benefit: food chain, photosynthetic Ex.: Spirogyra, volvox

Rhodophyta Approx. 4,000 sp. All multi cellular Cell wall: cellulose, caragreenan Red pigments Marine (deep waters) Ex. Red Algae

Phaeophyta Approx, 1500 sp. Multicellular Cell wall: cellulose, alginic acid Brown pigments Fresh and marine Benefit: food: rich in minerals, habitat, food chain Ex. Kelp