Brown Algae

• Marine
•  
• Macroscopic
•  
• Many can be filamentous with branches
• None are unicellular or colonial; all are multicellular
•  
• Those with holdfasts are very large
•  
• expanded thallus:
• -          Blade
• -          Stipe
• -          Meristematic region
• -          Holdfast

• Stores laminarin
• and mannitol is the primary carb that is translocated

• Many are in the shallow intertidal zones between high and low tide
•  
• Others float freely in the open ocaean

many observed around rocky shores

air bladders

• Diplobiontic (alt of gen)
•  
• Haplobiontic, diploid
•  

• Chlorophyll a and c
• Carotenoids, such as Fucoxanthin 

In cell wall, there is focoidon, which has sulfur

receptacles

Algin used for a food thickener, emulsifier, etc. (sources are laminaria,, aschphyllum, and macrocystus); it keeps the cell wall from drying out 

• Fire-suppressant bricks
• Fertilizer and livestock food
• Direct food source (laminaria [kombu] 
• Kelp= iodine rich 
• Iodine supplier 
• Primary food source