1910] SMITH—ZAMIA FLORIDANA 131 
size of its nuclei and the position of its walls suggest an origin from a 
single archesporial cell. It resembles, too, the group in the staminate 
strobilus which gives rise to the sporogenous mass in the microspo- 
rangium. Two pairs of cells (¢) just under the epidermis, from the 
Fics. 5, 6.—Fig. 5, detail of sporophyll of fig. 4, showing hypodermal arche- 
Sporial cell. X40; fig. 6, more advanced stage, showing group of meristematic cells 
(1) which may give rise to integument. X 1400. 
direction of their walls indicate that they have arisen from periclinal 
divisions of hypodermal cells, and suggest the first divisions causing 
the elevation of the integument. 
Just at this point there is the break in the continuity of the series 
relerred to, and the strobili of August 8, which is the date of the next 
Couection, show on either lobe of the sporophyll the projecting nucellus 
and the integument, which is only slightly elevated at this time. 
