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Re: Shireen's algae

Well, I finally found a BGA that has heterocyst and can fixed N2!
Scytonema bohneri.

It looks like little brown fuzzy balls attached. An interesting find and the
first heterocyst I've found to date looking at Aquarium algae.

Phormidium (very small BGA)
Oedogonium(attached to wood)
Spirogyra(infesting the Riccia)
Rhizoclonium also. 
Various diatoms.

Tom Barr