THE GREEN ALGAE OP NORTH AMERICA 33 



LAGERHEIMIA Chodat, iSgsb, p. 86. 



Cells ovoid or ellipsoid, the membrane bearing 2 or more 

 setae, the base with or without thickening ; chromatophores 

 one or many, parietal, with or without pyrenoid ; cells free 

 or cpntained in the mother cell wall. Reproduction as in 

 Oocystis, from which it differs only by the presence of setae. 

 Chodatella L,emmermann is included, its only difference from 

 Lagerheimia being the absence of thickening at the base of 

 the setae. 



KEY TO THE SPECIES OF LAGERHEIMIA. 



i. Setae from all parts of the cell. 2. L. Droescheri. 



i. Setae from ends only. 2. 



2. Cells with an obtuse projection at each end. i. L. citriformis. 



2. Cells without obtuse projection. 3. 



3. Setae 44-55 M long. 5. L. longiseta. 



3. Setae 7-26 M long. 4. 



4. Cells 12-21 X 9-15 M; 3-7 setae at each end. 3. L. ciliata. 



4. Cells 5-13 X 2.5-8.5 M; 2-3 setae at each end. 4. L. subsala. 



1. Iy. citriformis (Snow) nov. comb. ; Chodatella citrijormis 

 Snow, 1903, p. 381, PI. II, fig. VIII. Cell ellipsoidal with an 

 obtuse projection at each end, 13-23 X 8-20 /n; chromatophore 

 single, with pyrenoid ; setae slender, in whorls about the pro- 

 jections at the ends of the cells. Collins, 1909, Fig. 45. Lake 

 Erie. 



2. L. DROESCHERI (Lemm.) Printz, 1914, p. 60; Chodatella 

 Droescheri Lemmermann, 1900, p. 98, PI. Ill, fig. 12. Cells 

 10-16 X 5-12 /A, beset with numerous tapering setae, 10-17 /* 

 long. Wis., G. M. Smith. Europe. 



2. L,. CILIATA (L,agerh.) Chodat, iBg^b, p. 86; Oocyslis 

 ciliata Lagerheim, 1882, p. 76, PI. Ill, figs. 33-37. Cells 

 12-21 X 9-18 ft, solitary or 2-8 in a family; setae 3-7 at each 

 end, 18-20 i*. long. Wis., G. M. Smith. Europe. 



Var. minor (G. M. Smith) nov. comb. ; Chodatella ciliata 

 var. minor G. M. Smith, 1916, p. 477, PI. XXV, fig. 16. 

 Cells 8-10 X 6-7.5 /A, with 6-8 setae at each end. Wis., G. M. 

 Smith. 



Differs from the typical form by the smaller size, and usually 

 more abundant setae. 



4. L,. SUBSALSA Ivemmermann, i898b, p. 193, PI. V, figs. 

 2-6. Cells 5-13 X 2.5-8.5 //., solitary or 2-8 in a family ; setae 



