Contains 3 Phylum:

-Bacilariophyta

-Phaeophyta

-Oomycota

United by unique flagellar morphology

-4 membrane bound chloroplast 

-contain pigments Chlorophyll C, A & Fucozanthin

-Photo synthetic heterokont

-unicellular or colonial

-planktonic (float), epiphytic, benthic (bottom)

-Reserve materials: lipids, chrystolaminarin (carb)

-Cell Walls: frustules made of silica

-culture: primary producers, aquatic food chain base, form oil deposits.

-Abrasive organic insecticide made of tiny glass-like shards.

-very abrasive.

-made of diatoms

Phylum Phaeophyta

(Brown Alga)

-Salt water photosynthetic heterokont

-multicellular w/ tissue differentiation

-thallus (sporophyte), stipe, holdfast.

-reserve carb: laminarin

-culture: food, wildlife habitat, food additive

SPORIC meiosis with trumpet hyphae conducting cells (condut sugar)

Fucus, dicotomously brancing life cycle with conceptacle and receptacles: GAMETIC MEIOSIS

Phylum Oomycota

(Water Mold)

- Heterotrophic Heterokonts

-unicellular --> filamentous

-Coenocytic Hyphae (non septate)

Reserve Carb: Gylcogen

Cell walls: Cellulose

SEXUAL OR ASEXUAL

Saprophytes (live on dead things)

Zoosporangia (site of mitosis)

produces zoospores (clone of parents hyphae)

Phylum Myxomycota

(Plasmodial Slime Mold)

No close evolutionary relationships

Heterotrophs

Carb: Glycogen

PLASMODIUM: coenocytic mass of protoplasm 

PROTOPLASMIC STREAMING