Harriet E. Allison. 
3 X 4 
leaves are crowded upon the axis and each leaf-trace remains, 
relatively, a long time in the axis before turning into the petiole. 
In Fig. 3, 7-7, the leaf-trace of a leaf (No. 1) has been completely 
formed, and is seen to consist of a number of strands, which 
appear to be irregularly disposed in a circle. The course of the 
Fig. 3. Platycerium alcicorne. A series of transverse sections of the 
rhizome, arranged from below upwards; 1-11 show leaf-base (No. 1) and 
formation of leaf-trace of the succeding leaf; 11-24 show formation of 
leaf-trace and leaf-base (No. 2) ; a, external ring of sclerenchyma (seen in all 
the sections) ; b, vegetative bud at base of leaf ; c, rootlets surrounded by 
sclerenchyma. 
