Pyrobotrys

Pyrobotrys is a genus of green algae in the family Spondylomoraceae. It has a cosmopolitan distribution, found in fresh water rich in organic matter.

Pyrobotrys consists of colonies (termed coenobia) of four, eight or 16 arranged in two or four tiers, with a star- or mulberry-like shape. Cells are spherical, ovoid, ellipsoid, or pear-shaped. Each has two equal flagella, two contractile vacuoles at the base of the flagella, and a large cup-shaped chloroplast with or without a stigma with no pyrenoids.