1. MacroAlgae
Seaweed to you and me

2. aka Pneumatocyst
Thallus

3. The whole Thallus photosynthesizes
Stipe - holds up blades
Blades – more surface area for photosynthesis
Holdfast – holds thallus to substrate
Pneumatocyst – gas filled float to keep the seaweed buoyant.

4. Macroalgae structures Similar to plant structures
NO specialized water and food transport tissues
- no xylem (carries water from roots to leaves in plants)
- no phloem (carries food down from leaves to roots in plants)
But.....

5. 3 Divisions (phyla) Macroalgae
Grouped based on Color
(Pigments)

6. Macroalgae Chlorophyta- Green Phaeophyta- Brown Rhodophyta - Red
Closely related to plants
Chlorophyll a and b, caretenoids
Phaeophyta- Brown
Chlorophyll a and c, fucoxanthin, etc.
Rhodophyta - Red
Chlorophyll a, phycobilins (phycoerythrin, phycocyanin, etc.)

7. Chlorophyta – GREEN MACRO ALGAE
Ulva fasciata
Commonly Known as Sea Lettuce

8. Caulerpa taxifolia

9. Halimeda incrassata

10. Phaeophyta- Brown Macro Algae
Dictyota spp.

11. Padina spp.

12. Turbinaria ornata

13. Macrocystis sp. - giant kelp -kelp forests off California coast Although green in color. It is classed by his pigments

14. Seaweed Uses Agar and carageenan are important phycocolloids
Agar (RED)- used in Petri dishes,also used in things such as icings, canned meets, or as a clarifying agent in beers and wines
Carrageenan (RED)– used in Ice cream and puddings as an emulisifier, It is also commonly used in pharmaceuticals, cosmetics
Algin (BROWN)- help in the creation of rubbers and textiles, and the salts from algins make a clear thin film used commonly as a thickener as used in soups or sauces.

15. Rhodophyta –Red Macro Algae
Reds may not look red – often pigments masked by other pigments
Liagora spp.

16. Pterocladiella
Chondrus

17. Turf Algae Carpet of algae made up of many different species
Our living rock is a living example
Carpet of algae
made up of many
different species

18. Coralline Algae strengthens tissues w/ Ca2+ – decreases predation – important for adding Ca2+ to reef

19. Another name for seaweed is
Macroalgae
PhytoAlagae
Zooplankton
Turf Alagae

20. Which part of the MAcroalgae photosynthesizes?
Frond
Holdfast
Stamen
Thallus

21. Macro Algae is group by
Size
Shape
Color
Food Source

22. Which is NOT a color of Macro Algae?
Red
Green
Black
Brown