LEUCOPLASTIDS. 



43 



general protoplasmic mass of the cells, being no longer recog- 

 nizable. Those, however, which have been changed no further 



than bv loss of color, closely resemble another kind of granule ; 

 namely, leucoplastids. (For exceptions see Chapter X). 



174" Leucoplattids. These are found in parts which are 

 normally devoid of chlorophyll, such as tubers, rhizomes, etc. 



a 



Thev may be wholly colorless, or faintly tinsjecl with yellow, and 



/// *^ - 



hence are apt to escape detection. They ma}' be considered as 

 the points around which' starch accumulates when stored for the 

 future needs of the plant. Schimper, 1 who first accurately de- 

 scribed them in all their relations, terms them "starch genera- 

 tors ; ' they are also known as amylogenic bodies, which of 

 course means the same thing. They are seen to the best advan- 



1 Schimper: Bot. Zeit., 1880, 1881, 1883. 



FIG. 9 b. Same, more advanced: a, the amylogenic bodies are covered with starch- 

 grains; 6, two nuclei on a cell-wall, each surrounded by amylogenic bodies covered by 

 starch. 8 j. (Schimpev. ) 



FIG. 10. a. Young amylogenic bodies surrounding the nucleus of a cell in the root of 

 Phajus grandifolius; 6, same, with starch-grains developing; e, same, more advanced. 



B y. (Schimper.) 



