216 The Botanical Gazette. (July, 
Three oblique walls are formed one after another, thus giving 
rise to a three sided apical cell. The sporangium now projects 
slightly (fig. 4), and in the figure probably two segments have 
been cut off and will be devoted to forming the stalk of the 
sporangium. While it is true that the sporangium arises from 
a group of cells, and probably. some cells other than those 
heavily shaded (in fig. 4 those cut off from the original cell) 
take part in the formation of the sporangium, yet it seems 
equally probable that the entire sporangium can be referred 
to the single large cell (fig. 3). If this be true, a closer con- 
ion (fig. 5). Three cells, from their general shape, are evi- 
*L.ic., p. 362) 
