spherical colony of cyanobacteria blue-green algae gleotrichia

algae aquatic background bacteria biology black bluegreen botanical botany close closeup cluster colony cyanobacteria cyanobacterial cyanophyceae cyanophyta dark darkfield ecology enlarge enlarged fiber fibers filament filaments gleotrichia green illumination light live macro magnification magnify micrograph microphotograph microphotography microscopic microscopy nature organism photosynthesis photosynthetic prokaryote science scientific spherical transmitted yellow