1917] 



REED— LEAF NECTARIES 



23 1 



LITERATURE CITED 



J 



Bull. no. 131, Part V, Bur. 



Plant Ind., U.S. Dept. Agric. 

 Watt, George, Wild and cul 



3. Trelease, William, Nectar, its nature, occurrence, and uses. Published 



John 



W. Edwin 



5. Campbell, D. H., Mosses and ferns. 



EXPLANATION OF PLATES XII and XIII 



PLATE XII 



Fig. 1. — From transverse section of leaf showing papillate cell. 



Fig. 2. — First cell of pedestal cut off by cross wall. 



Figs. 3, 4, 5, 6.— Multicellular papillae showing pedestals with varying 



number of cells. 



PLATE XIII 



Fig. 7. — Vertical section through gland near one end showing papillae 

 and elongated cells; some of the latter have divided horizontally, and have 

 formed the wall of the gland. 



Fig. 8. — Vertical section through young gland showing first stage in 

 formation of wall (right side of figure) . 



Fig. 9. — Vertical section through midrib showing young papillae. 



Fig. 10. — Cross-section of several papillae showing first and second 

 vertical division. 



Fig. 11. — Cross-section of papilla showing periclinal walls. 



Fig. 



12. 



Cross-section of mature papilla showing divisions subsequent to 



those shown in fig. 



11. 



