112 WISCONSIN PHYTOPLANKTON 



OOCYSTIS PARVA W. & G. S. West PI. 22, Fig. 6. 



Jour, of Bot. 36: 335. 1898; G. S. West, ibid. 37: 223, pi. 394, figs. 14-17. 1899. 



Cells broadly fusiform to elliptic, ends pointed but without polar 

 nodules. Each cell with 1-3 parietal, laminate to disciform chloro- 

 plasts, with or without pyrenoids. Cells solitary or in families of 2-4-8. 

 (Facultative Planktont). 



Cells 4-7 //, broad ; 6-12 p. long. 



Beaver (1) (rr), Bettine (rr), Clear Crooked (rr), Cochrane (rrr), Crab 

 (rrr), Deer (rr), George (rr), Half Moon (rr), Hooker (rr), Little Bass (2) 

 (rr), Lynx (rr), Mendota (rr), Muskallonge (rr), Palmer (rr), Pine (1) (rr), 

 Rudolph (rr), Sand (1) (rrr), Stone (rr), Wolf (rr). 



OOCYSTIS GLOEOCYSTIFORMIS Borge. PI. 22, Fig. 7. 

 Botaniska Studier till. F. R. Kjellman 23, pi. 1, figs, la-lb. 1306. 



Cells narrowly elliptic with ends pointed. Chloroplast single, pari- 

 etal, without a pyrenoid. Cells in families of 2-4 within the old cell 

 wall, several cell generations frequently forming a single colony. Wall 

 enclosing colony with pointed ends but no polar nodules. (Tychoplank- 

 tont). 



Breadth of cell 3-5.5 p. ; length 8-15 /*.. 



Lac Court Oreilles (sss). 



The old mother cell wall does not gelatinize as readily in this species 

 as in others so that several cell generations are generally found in the 

 same colony. The species is best recognized, however, by the sharply 

 pointed ends of the colony wall. 



OOCYSTIS LACUSTRIS Chodat. PL 22, Figs. 8-9. 

 Bull. Herb. Boiss. 5: 119, pi. 10, figs. 1-7. 1897. 



Cells elliptic to broadly fusiform, somewhat pointed and with a 

 nodule at the poles. Chloroplasts 1-3, laminate, parietal, with or with- 

 out pyrenoids. Margins of chloroplasts sometimes irregular. Cells 

 rarely solitary, generally in families of 2-4-8 within the old mother 

 cell wall. (Euplanktont). 



Cells 8-22 /* broad, 14-32 p. long. 



Big Butternut (rr), Bone (rr), Center (r), Chain (rr), Chetek (r), Devils 

 (2) (ss), Dummy (rr), Fowler (rr), Hillman (rr), Little Bass (2) (rr), 

 Little Butternut (rrr), Long (2) (rrr), Long (3) (rrr), Mary (r), Mercer 

 (rr), Palmer (rr), Pokegama (3) (rr), Prairie (rr), Reserve (rr), Sand (4) 

 (rr), Sishebogema (rrr), Upper Nashotah (rrr), Upper Turtle (sss), White 

 Sand (rr). 



