Cyanobacteria
Fossil Collenia undosa, Minnesota
Scientific classification
Domain:	Bacteria
Phylum:	Cyanophyta
Family:	Spongiostromata
Subfamily:	Stromatolithi
Genus:	Collenia
species
C. frequens C. symmetrica C. undosa

Collenia is a genus of cyanobacteria that may form stromatolites.

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