Smith—Phytoplankton of the Muskoka Region. 351 
Staurastrum tetracerum var. trigonum Lund. 
Black (r), Butterfly (rrr), Harbon (rrr), Leech (rrr), Otter (rrr). 
Staurastrum leptocladum Nords. 
Basil (rr), Big Dudley (rr), Black (1) (ss), Burned Rock (sss), But¬ 
terfly (sss), Harbon (ss), Gull (1) (rrr), Gull (2) (rrr), Little Dudley 
(sss), Long (1) (cc), Long (2) (c), Loon (s), Muldrew (ss), Muskoka 
(ss), Nelson, (ss), Otter (rrr), Rosseau (rrr), Round (2) (rrr), St. Mary 
(rrr), Thompson (rrr), Vernon (ss). . 
W. & G. S. West (Jour. Linn. Soc. Bot. 33:317, 1898) have 
reached the conclusion that Nordstedt overlooked the subapical 
spines in his original description of the species, so that the variety 
cornutum described by Wille cannot be recognized. 
var. denticulatum var. nov. PI. XI, fig. 14. 
Variety with a broad, slightly emarginate sub-apical tooth in¬ 
stead of a sharp spine. 
Dimensions as in the typical form. 
Corner (r), Echo (rrr), Nine Mile (ss), Pennsylvania (rr), Pine (sss), 
Round (1) (rrr), Silver (1) (rr), Silver (2) (rrr). 
var. sinuatum Wolle 
Clear (ss), Gull (2) (rrr), Harbon (rrr), Mud (rrr), Round (2) (rrr), 
White (rrr). 
var. insigne W. & G. S. West. 
Pennsylvania (rrr). 
Staurastrum Johnsonii W. & G. S. West 
Basil (sss), Big Dudley (ss), Black (1) (sss), Black (2) (rr), Brush 
(c), Burned Rock (sss), Butterfly (rr), Clear (1) (rrr), Clear (2) (rr), 
Echo (sss), Gull (1) (s), Gull (2) (r), Harbon (rr), Henshaw (sss), 
Leech (c), Little Dudley (rr), Long (1) (r), Long (2) (s), Loon (rr), 
Mill (rrr), McGowan (rrr), Muldrew (ss), Muskoka (rrr), Nelson (sss), 
Nine Mile (sss), Otter (rr), Pine (rrr), Portage (rrr), Round (2) (sss), 
Rowley (rr), St. Mary (rrr), Silver (1) (r), Silver (2) (rrr), Strange 
(ss), Thompson (sss). 
Staurastrum americanum (W. & G. S. West) comb. nov. 
Staurastrum grallatorium var. americanum W. & G. S. West, Trans. Linn. 
Soc. 2 Ser. Bot. 5: 265. PI. 17, fig. 15. 1896. 
This alga, which was described by the Wests as a variety of 
S. grallatorium Nords., is sufficiently differentiated to warrant 
