PLANTS OF IOWA 83 



CYLINDROSPERNUM, Kg. 



1003. C. limnicola, Kg. 



Soil on pots in greenhouses. 



1004. C. comatum, Wood. 



Frequent on wet soil along brooks. 



1005. C. macro&pernum, Kg. 

 In ditches. 



SCYTONEMACE-ffi FAMILY. 



SCYTONEMA, Ag. 



1006. 8. tomentosum. 



1007. 8. myclirous, Keg. 

 Moist ground. 



RIVULARIACE.3E FAMILY. 



CALOTHRIX, (Ag.) Thur. 



1008. C. elongatum, (Wood.) 



1009. C. parietina, (Naeg.) Thur. 

 On stem of Phragmies. 



JSACTIS, Thur. 



1010. /. fluviatilis, (Eab.) Kirch. 



On damp limestone along streams. 

 OLOEOTRICHA, Ag. 



1011. G. pisum, Thur. 



One of the most abundant of the algae in some of the 

 lakes at certain seasons of the year. On weeds in 

 shallow water. 



DIATOMACAE. DIATOMS. 



COSCINODISCACE.E FAMILY. 



STEPHANDISCUS. 



1012. 8. niagarae, Ehrb. 

 Lakes. 



MEDIONACE^I FAMILY. 



MERIDION. 



1013. M. intermedium. 



