COMTAivATlVE ANATOMY OF THE CLXXTvuITACE-E. ÜO 



siiKill l)iiiKlle on the upper part of the central one (Momordica 

 CJuiranlia, Luffa cyHndrlca, L. acutaiigida, Trichosanlhes cu- 

 cumeroides, 2\ japonica, T. iindtiloh<t) ; the sixth has seven bundles, 

 the largest bundle undermost, the other six on each side and 

 above [Ciii'idlus vuhjaris, Cucurhiia Fepo). 



13. The petioles are solid in general, excei>t in ('iiawhiUi 

 Fcpo, Be/iuicasa cerifera and Luffa acuta nguhi, in which they 

 are hollow. The number of fibro-vascular bundles varies from 

 five {Actinosteinma raccmosuiii, MelotJirla japonica and Gyiiino- 

 steinma cissoides) to thirteen {Cucurbita Pepo). 



14. Stomata on the cotyledons are in many cases present 

 on both the upper and lower surfaces. Bloiitord'ica Cltaratiiia, 

 Tr'i('JiOS(i)dhes japonica, T. niultUoba and Gymnosiciinna cissoides 

 form an exception to this rule, the former three having the 

 stomata on the lower surface, very rarely on the upper ; while 

 the last has them exclusively on the under side. 



15. The pallisade parenchyma of the cotyledons is commonly 

 several-layered, while the spongy parenchyma is many-layered. 

 The mesophyll of the cotyledons of Jlouiordica C/iaraniia, 

 Trirhosanthes cuniuieroidcs, T. japonica, T. inuUiloIxi und 

 Gyiiinosteiniia( cissoides is, however, scarcely diiferentiated into 

 the pallisade and spongy tissues. 



16. The spongy parenchyma of the cotyledons of Aclino- 

 steiniiia racemosuin shows a reticulate appearance, the cells radiating 

 from a fibro-vascuhir bundle and thus leaving very large inter- 

 cellular spaces, so that it reminds one of the leaf-tissue of 

 water-plants. 



17. Unlike the common solid types, the stems of Cucurbita, 

 Fcpo, Benincasa cerij'era, Layenaria vulyarls, the hypocotyls of 

 Cucurbita Fepo, Beninousa cerifera, Layenaria vulgaris, Cucuiais 



