22 



Art. 5.— y. Toda; 



protonema to have the stracture of 

 resting filaments. The cells of tliese 

 filaments looked like those in Illus- 

 tration 2 : a thickening of the cell 

 walls and the existence of a num- 

 ber of oil globules in the cytoplasm 

 as illustrated in the figure were 

 observed. No spherical cells could 

 be found. 



In the vegetative green proto- 

 nema-filaments, starch is stored for 

 reserve food, while in the cells of 

 the resting filaments, fatty oil, in- 

 stead of starch, is stored for the 

 retention of vitality. illustration 2. a. b. Resting fiia- 



men tous cells filled with oil globnles. O. 

 That the resistance of the lu- ^ll globules. C. Eesting filamentous cell 



with a young coloiirless filament. F. young 

 mmOUS moss to desiccation is very vegetative filament. x580. 



great, is evident from the fact that after placing the Petri dish 

 mentioned above, in a hot-house for 20 days, supplying it all the 

 while with sufficient water, young colourless filaments were seen 

 produced from the walls of the resting filamentous cells (Illus- 

 tration 2, C). 



VI. Cultural Experiments. 



Camille Servettaz (8), in one of his recent papers, treats of 

 the development and nutrition of various species of moss in steriliz- 

 ed media. To determine what is the best nutritive solution for 

 the culture of Schistostsga, I took a number of Petri dishes and 

 filled half their depth with quartz sand carefully washed first in 

 fuming HCl ; and then in water from the conduit tap, for 24 hours. 



