28o 



BOTANICAL GAZETTE 



[OCTOBER 



T... 

 UE. 

 P... 

 Sp. . 

 LE. 

 OW. 

 Cu 



M 



148 M (137-168) 



Leaf 



LIRIODENDRON 



X 



Stem 



IS 



37 

 80 



16 



10 per cent 



25 



54 

 11 



2IO M (190-236) 



= 8 per cent 



17 



59 

 in 



22 



28 



53 

 11 



M X 



N. . . 79 131 



D. . . 34 n (48) 32 ft (41) 

 W... 3.1 



3-3 



5-6 



F. . . . 3.8 

 L. . . . 10. 7 

 R . . . 1-3 



s 



3.2 

 4.6 



8.5 

 2-5 



50 



X. — Cells of upper epidermis smaller 



Like the majority in all respects. In 



in surface and depth, side walls plane both, sclerenchyma around the pith and 

 (wavy in M); palisade deeper, sometimes groups of fibers capping the phloem, 

 of more layers; cells of upper layer each Figs. 12 and 13. 

 side of midrib larger than others and 

 without chloroplasts, as if a secondary 

 epidermis; vessels more numerous in 

 midrib; greater masses of fibers and 

 more coUenchyma. In both, lower epi- 

 dermis heavy . — Figs. 10 and 11. 



10 



12 



11 



Figs. 10-13. — Liriodendron tulipifera: 

 sections of leaves; fig. io, mesophytic 

 form; fig. 11, dune form; sections of 

 stems; fig. 12, mesophytic form; fig. 13, 

 dune form. 



13 



