306 



BOTANICAL GAZETTE 



[APRIL 



at the outer end, joins the thickened outer wall. The contents are of 



a dark-brown color. 



2. The subepidermal layer (sub) consists of two quite distinct 



tissues. Within the epidermis 

 is a layer, one to five cells 

 thick, consisting of small reti- 

 culated or pitted cells. In 

 tangential section (Jig. 46) the 

 zig-zag walls are seen to pro- 

 ject into the cavity, with an 

 intercellular space in the angle 

 of each projection. 



The second tissue consists 

 of one layer of cells, 20 fi in 

 thickness, polygonal and regu- 

 larly arranged in cross-section, 



and slightly elongated tangen- 

 tially. 



3 . A sclerenchyma layer 

 (scl) of cells radially elon- 

 gated up to 235 fi forms this 



ep. 



al — 



^3qpag03r^jgs%s$pa5^ 'yr 



i 



46 



47 



Fig. 44. Luffa cylindrica Roem. Seed. X i.— Fig. 45-— Lu $ a f' '"/epidertn 

 Tangential section of spermoderm, showing rods 'on radial walls *v ^ 

 X160.— Fig. 46. Luffa cylindrica Roem. Tangential section of s P enll0 Roen .' Set 



ing radial walls of subepidermal layer. X300.— Fig. 47- Lu $ a cyh , ''"-dermal lave'- 

 in cross-section; 5, spermoderm consisting of ep, epidermis, sub, subepi c ^ 

 scl, palisade sclerehncyma, />, parenchyma; N, perisperm; E, endosperm^ , 

 with ep, epidermis, and mesophyll containing al, aleurone grains. *i °- 



characteristic layer. The outer and inner w 



alls are *»* 



sending out peculiar branches. The cavity, best seen 



in cro 



«-sec- 



