We spent Wednesday afternoon sampling some ponds around Cambridge, looking for Volvox and related algae. Dr. Hisayoshi Nozaki, whose lab has described a substantial proportion of the known species, led the effort, but somehow we failed to locate our quarry.
Alexey says
It would be better to look for Volvox in temporary pools, which exist more than 10–12 days (especially those surrounded by green grass).