72 NORTH AMERICAN FLORA [Volume 7 



spores yellowish, originating from ends of the filaments, firmly compacted, cubical, polyhe- 

 dral or often more elongate radially, chiefly 10-12 ^ in length. 



On IyEmnaceae : 



Spirodela polyrhiza^ Connecticut, Massachussetts, Rhode Island, Wisconsin. 

 Type locality: Cambridge (Glacialis Pond), Massachusetts, on Spirodela poly rhtz a. 

 DiSTRiBtJTiON : New England and Wisconsin. 



Illustrations : Ann. Bot. d : pi. l,f. 59-64, pi. 2,f. 82-83 ; Bull. Conn, Geol. Nat. Hist. Surv. 

 5 : /. 20. 



ExsiCCATi : Seym. &. Earle, Econ. Fungi C55. 



