286 



BOTANICAL GAZETTE 



[APRIL 



Subepidermal layer (sub and fig 



On the flattened surface 



of the seed this tissue consists of one layer of longitudinally elongated 

 cells, arranged end to end in rows, while at the edge they are some- 

 what shorter and form several layers. They are quite large, ranging 

 from 50-175 (1 in length, and have thickened and sclerenchymatized 



walls. The most striking feature of the layer, best seen in 

 surface view, is the intercellular spaces which occur in great number 



- between the side and end wall 



They are very small, several 

 occurring in every turn of the 

 sinuous wall, which is greatly 



sinuous 



Fig i^.—Cucumis sativus L. Iso- 

 lated subepidermal cell of spermoden* 

 in surface view. X3°°- 



Fig. 12. — Cucumis sativus L. Seed 

 in cross-section. S, spermoderm consist- 

 ing of ep, epidermis, sub, subepidermal 

 layer, scl, sclerenchyma, p*, stellate 

 parenchyma, p* y spongy parenchyma; 

 iV, perisperm; £, endosperm; C, coty- 

 ledon consists of ep, epidermis and me- 

 sophyll with al> aleurone grains. X 160. 



One- 



Fig. t 4 .-Cucumis sativus U 

 half of isolated cell of sclerenchyma . 

 in surface view. X3°°- 



thickened about the space 



— - 



Between these spaces and also in 



the 



outer and inner walls are small pits. 



3 



rna 



{scl 



H 



I4) consists of one 



layer 



fi) cells with 



very 



g 



Heating 



all 



