Fresh Water Algae in Vicinity of Montreal 415 



Family 3. Tetrasporaceee. 



Tetraspora lubrica. Roth. 



Frond at first attached, soon splitting and form- 

 ing irregular expansions, often with many 

 rounded openings up to 20 cm. long and wide. 

 Very gelatinous, usually yellowish in color, 

 cells 7-11 micr. diam. Generally in fours. 



Mount Royal, Amherst Park, Verdun. 



Order III. Protococcales. 

 Family 1. Protococcaceae. 



Characium Sieboldii, A. Braun in Kiitzing. 

 Cells 15-25 x 4-9 micr. erect, lanceolate when 

 young, when adult short and broad. Stripe 

 short, without basal disk. On Vaucheria. 

 Bout de Tile. 



Family 2, Scenodesmaceas. 

 Raphidium falcatum, Corda. 

 Cells bright yellowish-green, slender, fusiform, 



ends acute. 1.5-3.5 micr. diam. 15-25 diam. long, 

 usually 2-32 united in a bundle. 

 R. falcatun var. aciculare, A. Br. 

 Very slender, 1.5-3 micr. diam., 15-20 diam. long, 



acicular, straight or slightly curved, usually 



solitary. 

 Very plentiful in every locality. 



Scenodesmus bijuga, Turp. 



Colonies of 4-8 cells oblong-ellipsoidal, with 



rounded ends 7-18 x 4-7 micr., arranged in a 



single or double row. 

 Every locality. 



S. bijuga var. alternans, Reinsch. 

 Cells broader than in the type, in two rows alter- 

 nately placed. 

 Every locality. 



