Botany online 1996-2004. No further update, only historical document of botanical science!
CYANOPHYTA (or CYANOBACTERIA):
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To the left: Bluish black looking coatings on moist rock are often caused by blue-green algae. To the right: Water bloom of the Amazon near Santa Rem that is caused by blue-green algae.
Concrete buildings in almost all cities of the tropics are coated by layers of blue-green algae.
