HOW TO KNOW THE FRESH-WATER ALGAE 



332b Cells flattened, appearing triangular in face view; fusiform in 

 side view. Fig. 237 GONIOCHLORIS 



/SSvStt^W /^\ Fig. 237. Goniochloris sculpta Geit- 



fe"^V//'°:V/^?^ / • • ^%\ !e r - a ' optical section showing 



|H:::::fl:: : ::":7:^ M ■' S?S^ chromatophores; b, exterior 



%(rl|||fm^^^ ff ." ""^X ' front ' view ' but fattened and 

 b ^^^ |B . . ,#v\ narrowly elliptic when seen from 



x^'uis^^?^ fefr^ ife^ ^ e si( ^ e ' ; c ' in ^ e i Qtera ^ view ^ e 



^^Sfltf^TvS^ ^^i^^-S^*^ overlapping of the 2 wall sections 

 ^Uss*****^^ ° sometimes can be detected. There 



c Figure 237 are 4 or 5 curved, plate-like chro- 



matophores. One species only has been reported from the United 

 States. 



333a (305) Cells attached by a stipe 334 



333b Cells without a stipe 335 



334a In a globular lorica (envelope) which has an anterior opening. 



See Fig. 220 PERON1ELLA 



334b Not in a lorica. See Fig. 219 OPHIOCYTIUM 



335a (333) With a mucilaginous sheath 336 



335b Without a sheath 339 



336a Cells numerous, oval, in a globular macroscopic, free-floating 



colony. Fig. 238 CHLOROSACCUS 



*" ' ' ,m ■" ill. td r i— 



a 



Figure 238 



Fig. 238. Chloiosaccus iluidus Luther (Gloeochloris Smithiana Pascher). 

 a, diagram of colony shapes; b, cells in mucilage. 



This rare species occurs as macroscopic gelatinous balls (up to 20 

 mm. in diameter) on the stems of submerged plants (including Chara); 

 occasionally may be found free-floating. The colony is composed of 

 irregularly arranged oval cells containing from 2 to 6 parietal chroma- 

 tophores (yellow-green). There is but one species. 



336b Cells shaped or arranged otherwise 337 



337a Cells solitary or in pairs at the ends of branched gelatinous tubes. 

 See Fig. 210 MISCHOCOCCUS 



337b Cells arranged otherwise 338 



142 



