THE GREEN ALGAE OF NORTH AMERICA 45 



Var. CHODATII G. M. Smith, 19163, p. 461, PI. XXX, figs. 

 111-114. Cells proportionally more slender, notches between 

 poles deeper; cells 11-15 X 4-5 /*. Wis., G. M. Smith. 



Var. SUBALTERNANS G. M. Smith, 19163, p. 461, PI. XXX, 

 figs. 115-120. Cells subalternately arranged, often pyriform, 

 3-5-5 /* Wis., G. M. Smith. 



12. S. HYSTRIX lyagerheim, 1882, p. 62, PI. II, fig. 18 ; Col- 

 lins, 1909, p. 169 ; G. M. Smith, 19163, p. 462, PI. XXVI, fig. 35. 



13 S. SERRATUS (Corda) Bohlin, 1901, p. 44, PI. I, fig. 2 ; G. 

 M. Smith, 19163, p. 465, PI. XXVIII, figs. 55, 57 ; Arthrodesmus 

 serratus Cords, 1839, p. 244, PI. VI, fig. 35. Colonies 4-celled, 

 in a single straight series, cells oblong-ovoid, end cells each with 

 a single longitudinal series of minute teeth, median cells each 

 with two series : poles of all cells with 3-4 teeth each, cells 15-20 

 X 4.5-7 M. Wis., G. M. Smith. Austria, Azores. 



14. S. ABUNDANS (Kirchner) Chodat, 1913, p. 77 ; G. M. 

 Smith, 19163, p. 465, PI. XXX, figs. 133-136; PI. XXXI, figs. 

 137-140; >S. caudatus var. abundans Kirchner, 1878, p. 98; S. 

 quadticauda var. abundans Collins, 1909, p. 169. Colonies 

 usually 4-celled, cells ovoid to oblong-ovoid, in- a strsight or 

 subalternate series ; end cells with spines at poles 3nd between 

 poles ; medi3n cells with spines at poles only ; cells 8-12 X 4-7 v- \ 

 spines 4-7.5 /* long. 



Var. LONGICAUDA G. M. Smith, 19163, p. 467, PI. XXX, figs. 

 121-125. Cells 7-9 X 3-6 /*; spines 6- 10 p. long. Wis., G. M. 

 Smith. 



Spines longer thsn in the typicsl form, but fewer. 



Vsr. SPICATUS (W. & G. S. West) G. M. Smith, 19163, p. 468, 

 PI. XXVII, fig. 51 ; XXXI, figs. -141-146; S. status W. & G. 

 S. West, 1898, p. 335. Colonies 2-4-celled, cells in 2-celled 

 colonies 3nd end cells in 4-celled colonies bearing a longitudinsl 

 series of 5-7 spines ; median cells of 4-celled colonies bearing 1-2 

 spines at each pole; cells 7.5-9 X 4 n; spines 2-2.5 /* long- 

 Wis., G. M. Smith. Europe. 



Var. BREVICAUDA G. M. Smith, 19163, p. 468, PI. XXX, 

 figs. 126-132. Cells smaller, 5-8 X 2.5-5 M ; spines 1.5-3 /* long ; 

 spines fewer, never 5 on a cell. Wis., G. M. Smith. 



V3r. ASYMMETRICA (Schroder) G. M. Smith, 1917, p. 468, 

 PI. XXVII, figs. 45-46 ; 5*. quadricauda V3r. asymmetrica 

 Schroder, 1897, p. 45, PI. II, fig. 5. End cells with 3 spine 3t 

 each pole; every cell with one lateral spine. Wis., G. M. 

 Smith. Europe. 



