2. Setae more than twice the length of the cell L. longiseta 



2. Setae shorter, twice the length of the cell or less 3 



3. Cells with 2 diverging setae arising near each apex. L. quadriseta 



3. Cells with more than 2 setae, arising at the apices of the cell 4 



4. Cells with 2-4 setae arising from each pole; cells ovate L. subsalsa 



4. Cells with 3-8 setae arising from each pole; cells oblong-ovate L. ciliata 



Lagerheimia ciliata ( Lag. ) Chodat 1895, p. 90 

 PL 55, Fig. 1 

 Cells oblong-ovate with 3-8 (usually 6) fine, tapering setae at 

 each pole; chloroplasts 1-4 parietal plates, each with a pyrenoid; 

 cells 6-18/i, in diameter, 10-21/i, long; setae 15-20;u long. 

 Rare; in plankton. Mich., Wis. 



Lagerheimia ciliata var. minor (G. M. Smith) 



G. M. Smith 1920, p. 129 



PI. 55, Fig. 2 



A variety with smaller, ovate, cells, 6-7.5/x. in diameter, S-lO^u, long; 

 setae up to 20/a long. 

 Rare; in plankton. Wis. 



Lagerheimia citriformis (Snow) G. M. Smith 1920, p. 130 



PI. 55, Fig. 4 



Cells ellipsoid, moniliform with knob-like extensions at the poles 

 (giving an Oocystis-like appearance to the cell); 4-8 long tapering 

 setae arranged in a whorl at each pole; 1 parietal chloroplast con- 

 taining a single pyrenoid; cells 8-20/i in diameter, 13-23f(, long 

 without the setae, which are 25-35/x long. 



Rare; in plankton. Mich., Wis. 



Lagerheimia citriformis var. paucispina 



Tiffany & Ahlstrom 1931, p.462 



PI. 46, Fig. 4 



Cells the same shape as the typical but smaller, 8-9/i. in diameter, 

 10-14/1 long; each pole provided with 2-4 setae. 

 Mich. 



Lagerheimia longiseta (Lemm.) Printz 1914, p. 60 



PI. 55, Fig. 5 

 Cells ovate or ellipsoid, with very long setae (more than twice 

 the length of the cell) arranged in a whorl of 4-10 close to the poles; 

 1 (?) parietal chloroplast without a pyrenoid; cells 5-8/i. in diameter, 

 9-13/t long without setae; setae 40-55/a long. 

 Rare; in plankton. Mich., Wis. 



f 250 1 



