— 272 



cell only 3 or 4 filaments growing out. Near their base a wall is 

 formed in the filaments. These filaments grow longer (fig. 17 c) 

 and divide very regularly many times pseudodichotomously having 

 a wall just over each side-branch (fig. 17 é). Fig. 17 f\ g show the 

 ramification as it takes place in a young filament. We find that 



Fig. 17. Chamædoris Peniculum (Sol.) O. K. 



a. b- c tops of young plants in different stages of development, in a the cell contents 

 have newly been divided, in b the young cells have swollen, the ring of warty out- 

 growths showing the first beginning of the filaments in the head, in c the warty out- 

 growths have grown longer, d- shows a longitudinal section through a somewhat 

 older specimen in which the filaments have begun to be divided, e- part of the fila- 

 ments. /. and g. young filaments showing the mode of cell division, h. and i. rhi- 

 zoid-like hapterae growing out from the filaments 1c. chromatophores with pyrenoids 

 and nuclei, (a. b. c d. e. about 10:1, /. g. h i. 25 ; 1, k. 250: 1). 



also here as in the stem the protoplasm first divides into some 

 smaller parts (fig. 17/) which surround themselves with a mem- 

 brane and grow together again and then a side-branch grows out 

 from the uppermost end of each of the parts in which the filaments 

 have been divided (fig. 17 g). The branched filaments are felted 



