via 



PREFACE. 



Micrasterias foliacea, BAILEY-RALFS. Desm. 210. Worden's Pond, Rhode Island, Bailey. 



Micrasterias Bayleyi, RALFS. Desm. 211. Rhode Island, Bailey. 



Euastrum oblongum, RALFS. DCS. 80. Rhode Island, Bailey. 



Euastrum crassum, KUTZ.-RALFS. Des. 81. Rhode Island, Bailey. 



Euastrum ansatum, EHRH. -RALFS. Des. 85. E. binale KNTZ. Providence. 



Euastrum elegans, KUTZ.-RALFS. Des. 89. Providence. 



Euastrum binale, RALFS. Desm. 91. Providence. 



Cosmarium cucumis, CORDA.-RALFS. Desm. 93. United States, Bailey. 



Cosmarium bioculatum, RALFS. Des. 95. Providence. 



Cosmarium MenegMnii, BREB.-RALFS. Des. 96. United States, Bailey. 



Cosmarium crenatum, RALFS. Des. 96. Providence. 



Cosmarium amcenum, BREB. -RALFS. Des. 102. Providence. 



Cosmarium ornatum, RALFS. Des. 1 04. Providence. 



Cosmarium connatum, BHEB. -RALFS. Des. 108. Providence. 



Cosmarium Cucurbita, RALFS. Des. 109. Providence. 



Cosmarium grandiluberculatum, OLNEY, n. s. ; "near C. cucumis, but with large tubercles on tho 

 frond." Providence. 



Staurastrum orbiculare, RALFS. Des. 125. Providence. 



Staurastrum hirsutum, RALFS. Des. 127. Providence. 



Stauraslrum Hystrix, RALFS. Des. 128. Providence. 



Staurastrum gracile, RALFS. Des. 136. Providence. 



Staurastrum tetracerum, RALFS. Des. 137. United States, Bailey. 

 Staurastrum cyrtocerum, BREB. -RALFS. Des. 139. Providence. 



Telmemoras Brebissoni, RALFS. Des. 145. Providence. 



Tetmemoras granulatus, RALFS. Des. 146. Providence. 

 Penium margaritaceum, BREB.-RALFS. Des. (Closterium EHR.) Providence. 

 Penium Digitus, BREB. -RALFS. Des. 151. ( Closterium lamellosum. ) 

 Docidium nodulosum, BREB.-RALFS. Des. 155. Maine to Virginia, Bailey. 

 Docidium Baculum, BREB.-RALFS. DCS. 158. United States. Bailey. 

 Docidium nodosum, BAILEY-RALFS. Des. 218. United States, Bailey. 

 Docidium constrictum, BAILEY-RALFS Des. 218. Worden's Pond, Bailey. 

 Docidium verrucosum, BAILEY-RALFS. Des. 218. Rhode Island, Bailey. 

 Docidium verticillatum, BAILEY-RALFS. Des. 218. Worden's Pond, Bailey. 

 Closterium Lunula, EHRH.-RALFS. Des. 163. New England, Bailey. 

 Closterium moniliferum, EHRH.-RALFS. Des. 163. New England, Bailey. 

 Closterium striolatum, EHRH.-RALFS. Des. 173. New England, Bailey. 

 Closterium cuspidatum, BAILEY-RALFS. Des. 219. Worden's Pond, Bailey. 

 Pediastrum telras, RALFS. Des. 182. New England, Bailey. 

 Pediastrum heptactis, RALFS. Des. 183. Providence. 



Pediastrum Boryanum, -MENEQH.-RALFS. Des. 187. Maine to Mexico, Bailey. 

 Pediastrum ellipticum, HASS. -RALFS. Des. 188. Maine to Virginia, Bailey 

 Scenedesmus quadricauda, BREB.-RALFS. Des. 190. Maine to Virginia, Bailey. 

 Scenedesmus obtusus, MEYEN.-RALFS. Des. 193. Maine to Virginia, Bailey. 



