VEGETABLE POWDERS 



287 



Fig. 69. CHONDRUS CRISPUS. a, cells of the outer tissue of the thallus; 

 b, cells from the inner portion of the thallus; c, a fungus very frequently present. 

 The hyphse show numerous transverse septse. The spores are elliptical (one being 

 shown in the figure). The diatoms so characteristic of agar are wanting in Chon- 

 drus. 



