146 | BOTANICAL GAZETTE [FEBRUARY 
A tangential section through the armor at the top of the stem 
(fig. 5) shows a condition exactly like that seen in WIELAND’S 
figures of Cycadeoidea. The peduncles of the cones, with their 
accompanying scale leaves, are wedged in among the leaf bases, 
and sections show that the cones arise in the axils of the leaves. 
Of course, the terminal peduncles of Dioon and similar forms 
finally become wedged in among the leaf bases, but the condition 
is secondary and is due to the sympodial nature of the stem; in 
Fic. 5.—M. Moorei: tangential section (cut with an ax) through the armor of 
leaf bases, showing the peduncles of cones surrounded by scale leaves. 
Macrozamia Moorei the condition is primary, the stem being 
monopodial, with all its cones lateral. 
In all the occidental cycads, Dioon, Ceratozamia, Microcycas, 
and Zamia,a single ovulate cone is a rule to which there are scarcely 
ever any exceptions, except in Zamia; in staminate plants excep- 
tions are almost as rare, except in Zamia, which very frequently has 
more than one cone, and sometimes as many as six or seven. 42 
Dioon, Ceratozamia, and Zamia, in both ovulate and staminate 
plants, the cone domes in the pith indicate the sympodial nature 
of the stem. Microcycas has not been examined, but will doubtless 
show cone domes. 
