Gloeocapsa; a Cyanobacteria, Photosynthetic, gram negative, 100X at 35mm. Formerly known as blue-green algae. Prokaryotic cell. Cells enclosed in layers of gelatinous material. [Getty Images]

Gloeocapsa; a Cyanobacteria, Photosynthetic, gram negative, 100X at 35mm. Formerly known as blue-green algae. Prokaryotic cell. Cells enclosed in layers of gelatinous material.

Photolibrary Ed Reschke