i6 



REGENERA TION 



new part may even appear in new tissue that covers the end, and, 

 further, since the process seems to include many factors that appear 

 also in animals, we are justified, I think, in including this process 

 in plants under the general term regeneration. 



FIG. 9. After Vochting. A, A 1 , A 2 . Pieces of thallus of Lvnularia communis regenerating at 

 the apical end. D. Piece of thallus cut in two in the middle line. Z?i. Same split at side of 

 middle. C. An oblique piece extending to middle line. C 1 , C 2 . Oblique pieces not extend- 

 ing to middle line. D. Fruiting stalk stuck into sand, producing new thallus above sand. 

 Z)l. Same laid horizontally regenerating near base. E. Same with fruiting head cut off. 

 Regenerating at base. i. Twisted piece regenerating at two points. F. Piece of ray of 

 head regenerating near base. />'*. Same with distal end of ray cut off. Also regenerating 

 at base. 



In the lower plants, such as the mosses, the liverworts, the moulds, 

 and the unicellular forms, regeneration also takes place. Vochting 

 has shown that pieces from any part of the thallus of a liverwort 1 

 produce new plants. If a cross-piece is cut off, there appears a small 



1 Lunularia vulgaris. 



