18 ART. 4. — A. YASUDA : ON THE 



GHAPTEE III. 



THE BLADE. 



TJpidernifs, AVhcn viewed from tlie surface the outlines of 

 tlie epidermal cells of the blades are straight or wavy : the former 

 is the case on the upper surface and the latter on the lower, 

 except in Schizopepon bryoniccfoHus, var. japonicus, 3Iomordica 

 Charantia, Lagenaria vulgaris, Trichosanthes japonica, T. multiloba 

 and Gymnodemma rissoides, where the walls of the epidermal 

 cells on the upper surface are also wavy. 



The size of epidermal cells of the blades is greatest in 

 Gymnoüemma cissoides, the average diameter reaching 0.O7 mm., 

 while in those of the remaining species it is 0.0.3-0.04 mm. 



The epidermal cells on the upper surfiice of the blade of 

 Tricliomnthes cucumeroides are very characteristic ; they are raised 

 into conical papillae pointing outwards (PL III. Fig. 39). 



In certain places on the under surfice of the blade of 

 CunirbUa Pepo the epidermal cells are two or three-layered, and 

 these places consequently assume a somewhat etiolated appearance 

 (PI. III. Fig. 42). 



The epidermis on the under-side of the blade of Jlojnordica 

 Charantia is characterized l)y having many enlarged cells, each 

 f which contains a globular cystolith" (PI. ill. Fig. 40). 

 JIo//wrdica Cliarnidia is the only species a.mong the plants we 

 have studied, which contains cystoliths. They are fixed to a 

 lateral w;dl ; iKjt, as we see in Fica.^, Jlorus and Zelkowa, to the 

 outer wall. The epidermal cells which contain the cystoliths are 



() 



1; U. Pexzio. 'Joe. cil. p. 39;".. 



