1. “Algae” Protista that are photosynthetic autotrophs Diverse morphology
Single cells, filaments, colonies, thalli
Polyphyletic
Polyphyletic
Three lines lead to multicellularity
Other groups

2. Green Algae Pandorina - clump Chlamydomonas – 1 cell
Life size
Pandorina - clump
Chlamydomonas – 1 cell
Ulothrix - filament
Large diversity in fresh water
Green algae are present in marine habitats but not as important as reds and browns
One line very close to plants
Same chemistry, morphology as plants
Shown here are various growth forms evolved from basic Chlamydomonas “building block” cell
100 μm
Ulva - sphere
Scale bars 10 μm
Ulva - sheet
½ Life size

3. Red Algae Polysiphonia – simple thallus Porphyra – sheet
Water soluble pigments
Blue-green bacteria
Red algae
Mostly marine
Cell walls with gels
Some complex thalli
Porphyra – sheet

4. Brown Algae
Brown algae exhibit the most complexly differentiated thalli
Note the internal structure of differentiated cell types (ignore the terms)

5. Diatoms
marine diatoms tend to be radially patterned while fresh water ones are bilateral

6. Euglena

7. Euglenoid movement and Flagellar movement in Euglena
Euglenoid movement in Eutreptiella