: Typically Green Algae ( Chlorophyta ). They contain chlorophyll a and b .
Color provides a major clue about the pigments the algae uses for photosynthesis:
: Sites like the NIWA Algae ID Guide and the Landcare Research Guide provide visual references for different habits. Easy identification of freshwater algae
: Likely Blue-Green Algae ( Cyanobacteria ). They contain phycocyanin. Note: Some like Nostoc form firm, jelly-like "freshwater grapes" attached to rocks.
: Often Diatoms . They contain fucoxanthin and have silica in their cell walls, making them look like tiny shards of glass under a microscope. 3. Use Quick Field Tests : Typically Green Algae ( Chlorophyta )
If you are observing algae in person, these simple characteristics can narrow it down:
For a more precise identification, you can use specialized tools: : Likely Blue-Green Algae ( Cyanobacteria )
: For student projects, a dichotomous key helps identify algae by asking a series of "yes or no" questions about its features. Algae Corner: How to Identify Different Algae Types