223 PRELIMINARY CATALOGUE OF PLANTS. 



O. gracillima, Kg. Small ponds. 



O. limosa, Ag. Wet earth. 



O. nigra, Vauch. Frequent. 



O. natans, Kg. Panther Pond, etc. 



O. princeps, Vauch. Dennisville. 



O. rupestris, Ag. Palisades, banks of Delaware. 



O. tenuis, Ag. Stagnant waters. 



Phormidium, Kg. 



P. cataractum, Rabh. Rapid waters. 

 P. Julianum, Menegh. 

 P. Lyngbyaceum, Kg. Bergen Co. 

 P. Naveanum, Grun. Bergen Co. 

 P. rufescens, Ag. Bound Brook. 

 P. vulgare, Kg. Frequent. 



Var. publican, Kg. Frequent. 



Leptothrix, Kg. 



L. ochracea, Kg. Ditches. 



L. seruginea (Hypheothrix), Rabh. Frequent. 



Gloeothece, Naeg. 



Aphanothece, Naeg. 



A number of varieties have been found, but as the genera are of 

 doubtful merit they are not enumerated. 



Merismopedia, Mey. 



M. convoluta, Breb. Frequent in ponds. 



Microcystis, Kg. 



Polycystis, Kg. 



Gloeocapsa, Naeg. 



Aphanocapsa, Naeg. 



Chroococcus, Naeg. 



These genera are represented by many varieties, but all are of 

 doubtful value as plants. They represent spore conditions of higher 

 forms, and therefore are not enumerated. 



