290 



BOTANICAL GAZETTE 



[APRIL 



having small side branches at right angles, and Moeller 22 describe 

 them as simple rods without branches. Like the latter author, 

 I find single straight rods, one on each radial wall, which stain 

 vellow with iodin and sulfuric acid, thus showing them to contain 



lignin. 

 2. 



4 



bidet 







al — '■ 



BoaHtw 



N 

 E 



C 



Fig. 



19.— Cue 1 1 mis Melo L. Isolated 



sclerenchyma cell of spermoderm. X 3 



00. 



is the most characteristic layer 

 of this seed. Whereas in C. 

 sativus it consists of but on 

 cell layer, in this species it ha 

 five or six layers of cells lon- 

 gitudinally elongated (except 

 at the edges) and arranged end 

 to end in rows. Both specie 

 have sinuous walls and char- 

 acteristic circular intercellular 

 spaces visible in cross- as well 

 as in longitudinal section. 

 The cells of the outer layer 

 are small, increasing inward in 

 size and thickness of wall with 

 every layer, until the inner 

 one is distinguished from the 



ft 



sclerenchvma 



only 



bv the 



so mew 



•hat more irregular ar- 



rangement • and ■ the slightly 



smaller size of the cells. 



(5c/ and 



3 



Sclerenchyma, 



This single 



fig-- I 9)- 



layer differs from tl 



sativus only in the 



cell 



C 



jn-effular 



contour of the outer surface, where the layer conforms to the s ape 

 of the inner surface of the preceding layer. 



4- Parenchyma (p* and p 2 ).— Beneath the sclerenchyma arc 

 sometimes two, layers of small cells, which are thin-walled, * derc ^ m 

 matized, and frequently pitted. This tissue gradually chang^ ^ 

 without inward to larger-celled parenchyma with larger interu 

 spaces. 



