the Monocotyledonous Leaf. 
483 
Figs. 15-21. (Lettering throughout:— m.b. = median bundle; m.l. = main lateral; /. = 
lacuna ; f. = fibres ; p.p. = palisade parenchyma. Xylem is represented solid black, phloem white, 
and fibres dotted. Fig. 15 a-d. Tritonia (garden hybrid). Fig. 15 A, B, c. Successive trans¬ 
verse sections of young leaf, passing through basal sheathing, and upper regions. Fig. 15 D. The 
pseudo-midrib {p.m.r .) from an older leaf ( x 23). Fig. 16 A and B. Transverse sections of sheath¬ 
ing and upper regions of leaf of Sisyrinchium sp. (x 23 circa). Fig. 17 a and B. Iris sp. Trans¬ 
verse sections of sheathing and upper regions of leaf ( x 14). Fig. 18 A and B. Acortis Calamus , L. 
Transverse sections of sheathing and upper regions of leaf ( x l j). p.m.r. - pseudo-midrib. A series 
of very small bundles lying close to both surfaces between the larger bundles has, for simplicity, been 
omitted. Fig. 19 A and B. Anigozanihos sp. Transverse sections of sheathing and upper regions of 
leaf ( x 7). Fig. 20 A-c. Tofieldia calyatlala, Wahl. Series of transverse sections through basal 
sheathing and upper regions of leaf (x 23). Fibrous bundle-sheaths not represented. Fig. 21. 
Transverse section of phyllode of Acacia cyclops, A. Cunn. (x 23). Some of the smaller bundles 
omitted. 
