cyanobacter are true bacteria.. they are procaryotes
algae are eucaroytes.
people include them as plants, some not.
http://www.botany.utoronto.ca/course...16-Jan-03.html
pea soup in ponds is not commonly caused by blue green bacteria.
Ingrid

Typically green ponds can be a result of a bacteria algae.
Cyanobacteria is just one example.


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