PLANTS OF IOWA 89 



PLEUROCOCCACE-ffi FAMILY. 



PROTOCOCCUS, Ag. 



1086. P. viridis, Ag. (Pluerococcus vulgaris, Menegh.) 

 Common everywhere, on moist wood, trees and rocks. 



HYDRODICTPACEJE FAMILY. 

 HYDRODICTYON, Roth. 



1087. H. retriculatiim, (L.) Lagerh. 

 In rivers. Rare. 



PEDIASTRUM, Meyen. 



1088. P. boryanum, (Turp.) Menegh. 

 Slough, amid Utricularia. 



1089. P. ehrenbergii, A. Br. 

 Slough, several collections. 



VOLVOCACE-ffi FAMILY. 



CHLAMYDOMONAS, Ehrb. 



1090. C. debaryana, Gorosch. 

 In a puddle after rain. 



GONIUM, Muell. 



1091. G. pectorale, Muell. 

 Aquarium; rain water pond. 



EUGLENA, Ehrb. 



1092. E. viridis, (Schrank) Ehrenb. 

 Common in stagnant water. 



1093. E. spirogyra, Ehrenb. 

 In aquarium. 



PANDORINA, Ehrb. 



1094. P. morum, (Muell.) Borry. 

 Aquarium. In pond. 



EUDORINA, Ehrb. 



1095. E. elegans, Ehrenb. 

 In ponds. 



VOLVOX, Ehrb. 



1096. V. glolator, (L.) Ehrenb. 

 In ponds ; frequent. 



