What is a coral ? Wallpaper 342 Valonia sp ((en) Bubble Algae, (de) Blasenalge, Kugelalge)

Valonia sp

Valonia sp (en) Bubble Algae, (de) Blasenalge, Kugelalge

Camera

Nikon D5100

Lens

AF-S VR Micro-Nikkor 105mm f/2.8G IF-ED