Our own vigorous strain easily cultured in simple Medium. Non-motile, spherical unicells with a single parietal chloroplast. Useful alga for showing oxygen liberation during photosynthesis. Or for use in haemacytometers as substitute for blood corpuscles.
Prior to use keep culture/s near a north facing window (no sunlight) at ambient room temperature 5-25°C. Cultures usually remain viable for several weeks.