Smith—Monograph of Scenedesmus. 
S. radiatus Reinsch. 
487 
Reinsch, 1867, p. 81; PI. VI, Fig. 6. Lagerheim, 1883, p. 65. 
Eichler und Raciborski, 1892, p. 16. Balsamo, 1900, p. 267. 
S. bijugatus var. radiatus . Hansgirg, 1886, p. 115. de Toni, 
1889B, p. 564. Migula, 1907, p. 658; PI. XXXV (K), Fig. 7. 
Teodoresco, 1907, p. 129. Chodat, 1902, p. 213. Brunnthaler, 
1913, pp. 169, 172. 
S', bijugatus forma radiatus. Pascher, 1903, p. 175. 
Selenastrum radiatum. Weiss, 1892, p. 37. 
Although this form is now generally recognized as a va¬ 
riety of S. bijuga, I believe that it should be placed as a 
synonym of Dimorphococcus lunatus A. br. 
S. rotundatus Wood. 
Wood, 1874, p. 91; PI. XI, Fig. 3. Wolle, 1887, p. 174; PI. 
CLVI, Fig. 27. de Toni, 1889B, p. 567. Stokes, 1893, p. 51. de 
Wildemann, 1893A. Iwanoff, 1899, p. 379. Balsamo, 1900, p. 267. 
Wood placed this species with Scenedesmus provisionally 
since he did not know where else to put it. The figures of 
Wood resemble Richteriella, while those of Wolle resemble 
Golenkinia. This species may safely be placed among the 
Phythelieae but the specific determination is perhaps diffi¬ 
cult. 
S. costatus, var. coelastroides Bohlin. 
Bohlin, 1893, p. 42. Chodat, 1902, p. 216; Fig. 142. Migula, 
1907, p. 657. 
S. coelastroides. Schmidle, 1898, p. 9; PL I, Fig. 1. Chodat, 
1913, p. 23. 
This form belongs in the genus Coelastrum and not Scen¬ 
edesmus. 
S. variabilis de Wildemann. 
de Wildemann, 1893A. de Wildemann, 1893B, p. 91. de Wilde¬ 
mann, 1895, p. 26. Cozette, 1904, p. 273. Loppens, 1908, p. 48. 
This species is worthless. The varieties cornutus and 
ecornis are synonyms of S. quadricauda and S. bijuga re¬ 
spectively. 
