Chapter XVIII 



— 207 — 



Lipide Granules 



plasm of the Thiobacteriales, very refractive granules which appear 

 to be sulphur. 



Many metabolic products are diffuse in the cytoplasm and cannot 

 be detected, but others can be brought out by microchemical re- 

 agents. Among these is glycogen which is so widely distributed in 

 fungi (Fig. 145) and which can be detected by the iodine-potassium 



Fig. 144 (left). — Spermophthora gossypii. 1, 2, Filaments with crystals of protein. 

 3, Detail of crystals. 



Fig. 145 (right). — Endomyces Magnusii. Living oidia and tip of a filament treated 

 with iodine-iodide. Small acacia-brown areas of glycogen (GL) are sometimes near the 

 nuclei (N) but are not related to the chondriosomes (C). L, lipide granules. 



iodide reagent, giving a mahogany-brown color. This product ap- 

 pears directly in the cytoplasm, generally around the vacuoles, or 

 the nuclei, in small areas which later run together and fill the entire 

 cytoplasm. At times when it accumulates in too great quantity in 

 the cytoplasm, the glycogen may even spread out into the vacuoles, 

 where it often is precipitated as small slightly refractive globules. 

 Lastly there are the amyloids, substances colored blue by iodine 

 which are diffused in the cytoplasm of some bacteria. 



