STERRENBURG, F.A.S. 2000 (Apr. 14) Studies on the genera Gyrosigma and Pleurosigma (Bacillariophyceae). Gyrosigma reversum (Gregory) Hendey and G. naja (Meister) Sterrenburg, nov. comb. Proceedings of the Academy of Natural Sciences of Philadelphia 150: 301-304, 10 figs. |