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