SINAPIS. MUSTARD. 



247 



colored from about half-way down, the outer walls 

 remaining thin and colorless or light yellow. 



Fig. 71. — Black Mustari>. 

 I, Stone cells of the walls of the seed, shown si i . and on 



end, Ps.fl. II, Epidermis cells on surface view. Ill . .K"'«-"t layer. 

 IV, Aleurone layer (Vogl), 



Beneath the palisade there follows a single row of tan- 

 gen tially arranged thick- walled cells, colored dark brown. 



