PLATE 50 
A. —Thin-walled parenchyma forming the satin tissue that lines the pod. X80. 
B. —Cross section of a vascular bundle of the pod. X420. 
C. —Section of epidermis of pod, showing a stoma and several of the basal cells from 
which the hairs arise. X80. 
D. —Fiber cells. X80. 
E. —Fiber cell in longitudinal section. X420. 
F. —Fiber cells in cross section. X420. 
G. —Cross section of velvet-bean pod, showing both conditions of surface hairs aris¬ 
ing from the epidermal layer. Both types of hairs are of similar construction, being 
unicellular except at base, which consists variously of from one to five or six cells. 
The hairs are granulate or roughened, increasingly so toward the apex. The longer, 
weaker-walled hairs have collapsed and become twisted or otherwise deformed and 
darkened in color, while the shorter, heavier-walled hairs remain stiff, tubular bristles, 
straight or sickle-shaped, and transparent. Underlying the epidermis is the layer of 
sclerenchyma tissue several cells in depth, and below this appear fiber bundles in 
cross section. X80. 
H. —Sclerenchyma cells. X80. These ceils vary greatly in size, ranging from 50 
to 234 n in length. 
I. —Sclerenchyma cells. X420. 
J. —Sclerenchyma cells in cross section. X420. 
(676) 
