130 BOTANICAL GAZETTE [AUGUST 
sporophylls, as shown in figs. 3 and 4. The lobes themselves are 
broader and the cells of the inner surface show a deeper stain, indi- 
cating that this is the region where active growth is taking place. 
This region is included by the dotted line drawn on one of the sporo- 
phylls in fig. 4. ; 
In a megasporophyll of July 25, of the size in fig. 4, a cell can be 
distinguished for the first time from those about it by its size and 
3 
Fics. 3, 4—Fig. 3, transverse section of staminate strobilus, showing nat 
phylls and position of sporangia (July 26). X40; fig. 4, transverse section of a 
strobilus (July 26), showing sporophylls and meristematic group of cells on one lo 
indicated by dotted line. x 40. 
by its larger nucleus with deeply staining chromatin. This cell 1s 
hypodermal in origin (fig. 5) and resembles the single archesporial 
cell in the staminate sporangium. About ten or twelve cells 7 
cross-section form a meristematic group, some of which are actively 
dividing, but this archesporial cell is easily distinguished from the* 
In another sporophyll of July 25, but evidently one a little more 
developed as shown by its increased size, the development of this 
group of cells has gone on still farther, and now four cells in TOS 
section can be clearly distinguished from the others (fig- 6). be : 
group is separated from the epidermis by one layer of cells, and the 
