PLATE XXXVIII. 



Figures magnified 375 diameters. 



p \(.l . 

 M i< i; v r i : r: i \- i i:i \\i,n, \itis, Pennsylvania and New Jersey form, 1 1"> 



Florida variety, . . 1 1"> 



MlCRASTERIAS CONFERTA Var. liamata, . . . .114 



Ml< B \ - 1 l l : 1 \~ LRCUATA, . . . . .117 



Mice wnki vs tri m \ta. . . . . . .114 



/ Var. semiradiata, Naeg., . . 114 



Var. concatenata, Wolle, . .114 



Var. minor, Wolle, . . 114 



Micrasterias foliacea, a single cell .... 118 



part of a series of more than forty cells, 114 





