23 



osmotic strength (see PRIESTLJTY" and IRVIITG, '07, p. ). 



The nuiaber of chroinatophores in a cell is very lojr^e. 

 In an older cell of average size, ahoiit 400,000v/ere esti- 

 mated to "be present. 



The chroinatophores in the protoplasi.iic pc^ds lying on ^ 

 t]ie cross walls are Liuch fewer and smaller than 



in other portions of the cytoplasm, 



Chroinatophores apparently a.re a,hsent from some lateral 

 cells when first cut off; nor have they been seen in the 

 young procarps, in the hair cells, in the stalk cells of the 

 tetrasporangia, or in the young tetrasporangia. While no 

 leucoplasts have been deraonstrs^ted in these cells, it is 

 possible that they are present. 



In dividing, the chroma.tophores simply pull apart. 

 They first elonga.te and the pigment collects in each end; 

 then they assume approximately a dumb-bell shape; and fi- 

 nally either separate completely, or more usiially remain 

 connected by a fine strand, as tJiough tJie division v/ere not 

 quite complete (fig , 36) . 



Starch is normally present in the vegetative cells, 

 as has been found to be true of Florideae generally by 

 BITTSCHLI ('03), BRUNS ('94), KOLKWITZ (»99), and others. 

 It occurs as very small granules in circular groups 

 or as larger granules lying in tlie cytoplasia between the 



