900 



STARCHES OF CYCADACE^. 



NOTES ON THE STARCHES OF CYCADACE^. (Charts 398 to 400.) 



All the starches of Cycadacece belong to the same type. Those of Cycas and Dioon are so alike 

 in all particulars that differentiation by gross histological characteristics seems impossible, but 

 the starch of Zamia may readily be distinguished from those of Cycas and Dioon by the marked 

 difference in size. By means of their reactions each genus can positively be differentiated one from 

 the others, Crjcas and Dioon being closer than either with Zamia. 



50 

 55 



60 

 65 



Curve of Reaction-Intensities of Starch of Cycas. 



Curve of Reaction-Intensities of Starch of Dioon. 



P I GV T P 



Chart No. 400. 



I GV S T CI CA PA FC P S CI PA CA 



Curve of Reaction-Intensities of Starch of Zamia. 



