Qg2 BOTANICAL GAZETTE [AUGUST 
eaves, and a crown of scale leaves appearing as a whitish triangular 
cluster in the figure, while the growing point itself is becoming 
transformed into a cone, a fact evidenced, as yet, only by a slight 
elongation, the point, while producing only vegetative leaves, 
ne 5: —Dioon spinulosum: transverse section at about the level of the top of 
fig. 4; th t ring is the cone dome; beyond this is the vascular cylinder, with 
the gra (quite dark) and the phloem (much lighter) about equal in width; the 
girdle leaf traces (/) are prominent; 4. 
being convex or at most hemispherical. Young cones of Zamia 
also may be distinguished from vegetative growing points, even 
before any appearance of sporophylls, by the elongation. 
As the new apex develops, the old peduncle is pushed aside, 
new tissue gradually surrounds its base, and finally whatever 
