PLANTS OF IOWA |] 



Xanthidium, Ehrb. 



1115. X. antilopceum, Kuetz. 

 Slough. 



Arthrodesmus, Ehrb. 



1116. A. incus, (Breb.) Hass. 

 Slough. 



Euastrum, Ehrb. 



1117. E. binale, (Turp.) Ralfs. 

 Slough. 



MlCRASTERIAS, Ag. 



1118. M. truncata, (Corda.) Breb. 

 Slough. 



Staurastrum, Meyen. 



1119. 8. pygmceum, Breb. 

 Slough, amid TJtricularia. 



1120. 8. margariaceum, Menegh. 

 Slough. 



1121. S. Polymorphum, Breb. 



Slough, amid TJtricularia, or decaying rushes. 



1122. S. crenulatum, (Depl.) Naeg. 

 Slough, amid TJtricularia. 



VAUCHEEIACE^: FAMILY. 



Vaucheria, DC. 



1123. V. aversa, Hass. 

 River bank. 



1124. V. sericea, Lyngb. 



In water, or wet places. 



1125. V. dillwynii, Ag. 



On damp, or wet ground, in shaded plao 



1126. V. sellilis, DC. 

 On damp soil. 



1127. V. geminata, DC. 

 Not common. 



1128. V. germinata, var. racemosa, Walz. 

 In stagnant water. 



