192 NOTES ON CETRARIA ISLAND1CA. 



The unusual behavior of isolichenin towards amylolytic 

 enzymes the formation of dextrins without sugars recalls 

 the formation (from glycogen) of dystropo-dextrin, an achro- 

 odextrin resisting the further action of enzymes.* 



The peculiar carbohydrates of Cetraria islandica are doubt- 

 less merely types of those occurring in numerous other 

 varieties of this group of plants. 



* Seegen, Archir f. d. ges. PhysioL, 1879, xix, p. 106; Tebb, M. C., Journal 

 of Physiology, 1898, xxii, p. 428. 



