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¥ small number of groups of plants has no starch been fcund up to the 
present time, as in many Algz and Fungi. 
The purpose of the forma- 
tion of starch is that it may be stored up in the cells as a reserve food- 
material, which becomes dissolved in the subsequent formation of new 
f 
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Frc, 51.—Longitudinal section through the inner bark of the stem of Hoya 
Together with the thin-walled parenchyma, partly containing 
chlorophyll with starch-grains, partly crystals @ and £7, are bands of 
very strongly thickened pitted parenchymatous cells p, and laticiferous 
CarIUOSA. 
vessels 72 772. (X 250.) 
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cells, and can then be used as a formative material. Itis, therefore, de- 
posited in especially large quantities in bulbs, tubers, seeds, pollen- 
grains, and generally in those organs which, when vegetation awakes, 
