A free living nitrogen fixing cyanobacterium which can also form symbiotic association with the water fern azolla
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Anabaena azollae is associated with azolla fern
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Anabaena is a free-living nitrogen fixing cyanobacterium which can form symbiotic association with water fern Azolla.
The alga Tolypothrix belongs to class-Cyanophyceae. Some forms of Chlorella form symbiotic association in lichens and in certain invertebrates such as Hydra, Paramecium and sponges.
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