CATALOGUE OF PLANTS. 413 



Z. tenue, Rab. 

 Z. Vaucheria, Ag. 

 Z. purpureum, Wolle. 



Z. cruciatum, Ag. 



All these species are widely distributed throughout the State, 

 in ponds and streams. 



ZYGOGONIUM, Kutz. 



Z. pectinatum, Kutz. 



Stagnant waters ; frequent. 



MOUGEOTIA, De By. 



M. sphserocarpa, Wolle. (M. Isevis of the Prelim. Cat.) 

 Sussex : Franklin Pond. 



DESMIDIEJE. 



GONATOZYGON, De By. 



G. asperum (Ralfs), Rab. 

 In ponds ; frequent. 



G. pilosum. Wolle. 

 Same habitat. 



HYALOTHECA, Bhrb. 



H. dissiliens (Smith), Breb. 



In sluggish, shallow waters ; frequent. 



H. mucosa (Mert.), Ralfs. 



In similar situations. 



H. undulata, Nordst. 



In ponds ; frequent. 



H. dubia, Kutz. 



Same habitat; occasional. 



