156 MIDDLESEX FLOKA. 



DRAPARNALDIA, Ag. 



D. glomerata, Ag. 



Everywhere common in fresh water brooks in spring and early- 

 summer. 



STIGEOCLONIUM, Kuetz. 



S. tenue, Kuetz. 

 In running brooks, fresh water, not uncommon. 



CH^ETOPHORA, Schrank. 



C. endivaefolia, Ag. 



In brooks in early spring; rather common and quite variable. All 



our species of this genus are fresh water plants. 

 C. pisiformis, Ag. 



Newton (W. G. Farlow) ; Ashby, Medford, and Melrose. Same 



localities as the preceding, but less frequent. 

 C. tuberculosa, Ag.? 



Billerica (Edwin Faxon). May possibly be a form of some other 



species. 



CLADOPHORA, Kuetz. 



C. aegagropila, Kuetz. 



Lake Quannapowitt, Wakefleld. 

 C. leetevirens, Harv. 



Medford salt marshes. 

 C. gracilis, Kuetz. 



Medford and Everett, in salt water. 

 C. fracta, Kuetz. 



In slightly brackish water, clay pits, Medford. 

 C. expansa, Kuetz. 



Medford and Everett, common in shallow pools in salt marshes. 



CHROOLEPUS, Ag. 



C. umbrinum, Kuetz. 

 Newton (W. G. Farlow). 



KHIZOCLONIUM, Kuetz. 



R. riparium, Harv. 



Salt marshes, common. 

 R. tortuosum, Kuetz. 



Medford salt marshes, not common. 

 R. Kochianum, Kuetz. 



Medford salt marshes, in tide pools, mixed with other algae. 

 R. lacustre, Kuetz. 



Newton (W. G. Farlow). 



