Plate I. 



Fig's. 1 & 2. Heliotropisni of the shoot of ScJiistostega osmimdacea (Dicks.) 

 MoHE. ; / first direction of rays ; ^ direction of rays after being 

 turned 180°; ^' direction of rays after being turned 180° again. 



Fig. 3. Position of the chromotophores in the cell of the protonenia when 

 placcxl in the light (Apostrophe). 



Fig. 4. Position of the chromotophores in the cell of the protoncma when 

 put in a dark room (Apostrophe). 



Fig. 5. Heliotropism of the protonema in a blue light ; / direction of rays. 



Fig. 6. State of the cell of the protonema shrinking at — 15°C. 



Fig's. 7 , 8 & 9. Protonema in a state of desiccation. 



7. filamentous cell ; 8. tadpole-shaped protonema ; 

 9. lens-shaped cell. 



Fig. 10. Protonema cultured in Knop's sjlutiou. 



Fig. 11. Spore. 



Fig's. 12 & 13. Cylindrical filament issuing from the spore. 



Fig's. 14 iSi 15. First lens-shaped cell produced from the filament. 



Fig. 16. A row of lens-shaped cells produced by budding. 



Fig. 17. Filamentous cell produced from the terminal lens-shaped cell. 



Fig. 18. Beginning of ramification. 



h) new cell produced by budding. 



