Nature of aerial Tubers in Dioscorea sativa , Linn . 501 
EXPLANATION OF FIGURES IN PLATE XXVI. 
Illustrating Miss Dale’s paper on Dioscorea sativa . 
Fig. 1. Longitudinal section through a node of Dioscorea sativa, showing young 
tuber and young inflorescences, s. main stem ; a. petiole ; b. young inflorescences ; 
c. bud on young tuber. 
Fig. 2. Longitudinal section through older tuber about 2 mm. in diameter. 
s. main stem ; b. young inflorescence ; c. buds on tuber. 
Fig. 3. Old axillary tuber which has produced long shoots without being 
planted or watered, s. stems ; r. 1 undeveloped adventitious roots on the tuber ; 
r 2 young adventitious roots on the young shoots ; sc. scales; /. arrested leaves with 
branches in their axils. 
Fig. 4. Part of one of the shoots produced by an unplanted tuber, t. tuber; 
/. arrested leaf ; b. bud ; br. branch. 
Fig. 5. A tuber on a similar branch, t. tuber ; a. petiole ; b. branch ; c l , c 2 , c 3 , 
buds ; d. root. 
Fig. 6. Axillary tuber T, which has been planted and produced a new tuber, 
t ; s i, scar of first developed bud, injured by an accident ; ^ 2, second stem replacing 
the injured one ; r. 1 undeveloped adventitious roots on old tuber ; r 2 adventitious 
roots on young tuber. 
Fig. 7 . Behaviour of the axillary tuber T , of another species of Dioscorea , 
perhaps D. divaricata. 7 " 1 , newly developed part of original tuber ; t. new 
tuber; b. bud on original tuber. 
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