Algae: Vegetative Structure

ALGAE

VEGETATIVE STRUCTURE
Thallus- body of algae * Holdfast (root) * Stipe (stem) * Blade (leaf)

Pneumatocyst-gas filled chamber

LIFE CYCLE
Asexual (Fragmentation)
Sexual

NUTRITION
Photoautotrophic

DIFFERENT PHYLA 1. Phaeophyta / Brown A * Kelps * Algin-thickener (ice cream, lotions)

2. Rodophyta / Red A * Deeper * Agar * Carageenan- thickener evap, ice cream, drugs; from Irish Moss * Gracillaria spp.- food source

3. Chlorophyta / Green A * Uni/multi * Cellulosic cell wall * Store starch * Give rise to terrestrial plants a) Desmids- uni c (bananas) b) Spirogyra- filamentous; green strands c) Chlamydomonas- biflagellated; stigma d) Volvox- colonial alga; biflagellated e) Euglena- chloroplast| Algae: Stigma; 1 flagellum; pellicle| Proto: cystostome

4. Baccillariophyta / Diatoms * Cell wall: pectin and silica * Planktonic * Produces DOMOIC ACID * Sediments; diatomaceous earth

5. Dinophyta / Dinoflagellates * Plankton * Fire algae * Alexandrium- red tide * Gambierdiscus toxicus

6. Oomycota / Water Molds * Carry photosynthesis; plant parasites * Phytophora (Potato Blight)

7. Charophyta / Stoneworts * Ancestor of mosses * Chlorophyll a and b

8. Chrysophyta / Golden Algae * Chlorophyll a and c * Accessory pigment: fucoxanthin * Laminarin and chrysolaminarin * Unequal flagella

9. Cyanobacteria (Blue-green algae) * Lacks nucleus * Phycolbilins * Spirulina- high protein dietary supplement

ROLES:

1. Food Chain 2. 80% Earth’s O2 3. Petroleum 4. Symbiosis 5. Decomposition of O2 in H2O

ALGAE as entrée

LAMINARIA
-Kombu (J)
-Hai dai (C)

PORPHYRA
-Nori; Amanori (J)
-Zicai (C)

UNDARIA
-Wakame

ASPARAGOPSIS TAXIFORMIS
-Limu kohu

CODIUM
-Limu wawaeiole

GRATELOUPIA FILCINA
-Limu huluhuluwaena

ULVA
-Limu