Smith—Phytoplankton of the Muskoka Region. 327 
var. planctonica G. M. Smith 
Black (1) (rr), Black (2) (cc), Burned Rock (rr), Butterfly (r), Gull 
(1) (ss), Lake of Bays (ss), Leech (rr), Long (2) (ss), Muskoka (ss), 
Marion (rrr), Strange (rrr), Vernon (sss). 
Aphanocapsa Grevillei (Hass.) Kab. 
Pine (rr), Otter (rrr). 
APHANOTHECE Nageli 1849 
Aphanothece clathrata W. & G. S. West 
Vernon (rrr). 
Aphanothece stagnina (Spreng.) A. Br. 
Leech (rrr). 
GLOEOTHECE Nageli 1849 
Gloeothece linearis Nag. 
Cells 13.5-20 fx long; 3.5-4.5 [x broad. 
Long (1) (rrr). 
DACTYLOCOCCOPSIS Hansgirg 1888 
Dactylococcopsis rhaphidioides Hansg. 
Cells 2.5-3.5 /x broad; 7.5-21 fx long. 
Basil (r),Clear (1) (rr), Clear (2) (rr), Hamer (cc), Lake of Bays (rr), 
Long (1) (rr), Muldrew (rrr), Muskoka (rrr), Nelson (rrr), Rowley 
(rrr), St. Mary (rrr), Silver (2) (rrr), Vernon (rrr). 
This seems to be a widely distributed alga in the Muskoka region. 
The organism resembles Rhabdoderma lineare Schmidle & Lau- 
terb. in general appearance, but differs in the cell ends being at¬ 
tenuated to a rounded point instead of having cylindrical cells that 
are not attenuated. The two daughter cells resulting from the 
division of any cell remain unchanged for some time so that the 
two poles of a cell are different, as in Elaktothrix gelatinosa Wille. 
The gelatinous envelope of the individual cells was evident in 
many colonies, but in others it was completely confluent with the 
colonial envelope. The distribution of the cells within the co¬ 
lonial envelope is not regular, although a majority of the ^ells 
have their long axes parallel. 
Dactylococcopsis acicularis Lemm. 
Clear (2) (rrr). 
