Hoham, R.W. Marcarelli, A.M. Rogers, H.S. Ragan, M.D. Petre, B.M. Ungerer, M.D. and Francis, D.O. The importance of light and photoperiod in sexual reproduction and geographical distribution in the green snow alga, Chloromonas sp.-D (Chlorophyceae, Volvocales). Hydrological Processes 14:3309-3321.