G. JR. Wieland — Notes on Living Cycads. 



335 



In figure 2 is represented a typical main branch of a male 

 trunk in full fruit which has just begun to form a second 

 bifurcation. The other main branch, bearing a single large 

 male cone, is not shown. In the large main branch as figured 

 two cones are borne by the left and three by the right of the 

 newly forming branches. 



So far as can be seen on the outer surface, these Zamia 

 trunks, as first dug up, are rather smooth, and do not appear at 

 first sight to possess the outer armor of spirally arranged leaf 

 bases so characteristic of other cycadean forms. Just below 



Figure 3. — Zamia floridana'DC x%. 

 Miami, Florida. 



a. Upper third of long and slender young trunk with leaves cut away, 

 and the surface lightly cleared of scaly and hairy material to show the slowly 

 disappearing remnants of old leaf bases. Further down, that is on the lower 

 two-thirds of the trunk, the leaf bases are indistinct. 



All of the trunk as well as all of that portion of the petioles shown at the 

 summit was subterranean. 



6. Transverse section of the same trunk cut further down at thickest point, 

 showing the central pith or medulla, the xylem or wood zone, and the 

 cortical parenchyma, irregularly traversed by vascular bundles. There is no 

 armor, this being replaced by a very thin corky layer. 



the petioles of the crown of leaves there is a thin and rough 

 covering of scattering scale-like bodies and fine hairy material. 

 Below this the trunks appear to be irregularly ridged horizon- 

 tally, these ridges soon disappearing, so that the lower half or 

 two-thirds is quite smooth in most places, and the armor of old 

 leaf bases absent. 



