PLANTS OF IOWA s3 



Cylindrospernum, Kg. 



1003. C. limnicola, Kg. 



Soil on pots in greenhouses. 



1004. C. comatum, Wood. 



Frequent on wet soil along brooks. 



1005. C. macrospernum, Kg. 

 In ditches. 



SCYTONEMACE^E FAMILY. 

 SCYTONEMA, Ag. 



1006. S. tomentosum. 



1007. S. my citrous, Keg. 

 Moist ground. 



RIVULARIACE^ FAMILY. 



Calothrix, (Ag.) Thur. 



1008. C. elongatum, (Wood.) 



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

 On stem of Phragmies. 



Isactis, Thur. 



1010. I. fluviatilis, (Rab.) Kirch. 



On damp limestone along streams. 

 Gloeotricha, Ag. 



1011. G. pisum, Thur. 



One of the most abundant of the alga* in some of th»» 

 lakes at certain seasons of the year. On weeds in 

 shallow water. 



DIATOMACAE. DIATOMS. 



COSCINODISCACE.E FAMILY. 



Stephandiscus. 



1012. 8. niagarae, Ehrb. 

 Lakes. 



medionace^e family. 

 Meridion. 



1013. M. intermedium. 



