Portrait of the eustigmatophyte, Chlorobotrys regularis West, 1903 (Bohlin, 1901). Spherical paired cells enclosed in a faintly laminated mucilagenous sheath (seen well in this phase contrast image). Multiple parietal chloroplasts. The red spot in each cell is an oil globule. Collected from a freshwater pond near Idaho City, Idaho. June 2005.Phase contrast.