MIDDLESEX FLOE A. 151 



THAIvLOPHYTES. 



CHARACE/E. 



NiTELLA, Ag. 



N. capitata, Ag. 



Cambridge (A. Brauu, Monograph). 

 N. flexilis, Ag. 



Cambridge (Froebel, in A. Br. Mouogr.) ; Melrose and So. Natick 



(Rev. Thos. Morong). 

 N. acuminata, A. Br., subsp. glomulifera, A. Br. 



Glacialis, Fresh Pond, Cambridge (W. G. Farlow). The specimen 



in Herb. Decaisne from the Merrimack liver, collected by Greene, 



mentioned by A. Braun in the Monograph, in all probabilit}'^ is from 



Middlesex county. 

 N. mucronata, A. Br., subsp. virgata, A. Br., var. tenuior, 



A. Br. 



Cambridge (A. Br. Monogr.) The var. robustior, forma longi- 



furca, A. Br. of this subspecies is mentioned in the Monograph 



as having been collected in the Merrimack by Greene with the 



preceding species. 

 N. gracilis, Ag. 



Melrose (F. S. Collins) ; Spot Pond, Stoneham (Eev. Thos. Morong). 

 N. tenuissima, Kuetz. 



Spot Pond (C. E. Faxon) ; Mystic Pond, Medford (C. E. Perkins) ; 



Ashland and So. Natick (Eev. Thos. Morong). 

 N. polygloclnin, A. Br., subsp. megacarpa, A. Br., (N. mega- 



carpa, Allen). 



Winchester (Eev. Thos. Morong). 



Chara, Leonh. 



C. coronata, A. Br. 



Cambridge (B. D. Halstead) ; Maiden (F. S. Collins). 

 C. coronata, A. Br., var. Schweinitzii, A. Br. 



Cambridge (Eev. Thos. Morong); E. Medford, abundant in slightly 



brackish water in clay-pits (F. S. Collins). 

 C. fragilis, Desv. 



Cambridge (C. E. Perkins) ; Natick (Eev. Thos. Morong). 

 C. sejuncta, A. Br. 



Spot Pond and Ashland (Eev. Thos. Morong). 



