
Fig. 174. Tuber of potato 
(< 4) 


Fia.176. Hydnophytum, an epiphytic plant 
The swollen base of the stem is composed 
largely of water-storing tissue and con- 
tains cavities inhabited by ants. (x 4) 

KG. 175. Corm: of taro (Colocasia 
esculentum). (X #) 

Fig. 177. Polypodium sina- 
tum, a fern having hollow, 
fleshy stems inhabited by 
ants. (X 3) 
