270 



as a rule not ramified and end in a small irregularly lobed disc. 

 The rhizoids are separated by a cross wall from the mother peri- 

 central cell. The cylindrical part of the rhizoids is 50 // thick. 



Fig. 265. Polysiphonia variegata (Ag.) 

 Zan. Summit of filament with tricho- 

 blasts and branches. (About 200 : 1). 



Fig. 266. Polysiphonia variegata (Ag. 



Zan. Part of filament with tetra- 



sporangia. (About 30:1). 



The plant has commonly 6 pericentral cells, sometimes in the 

 basal part 7 and in the upper part 5 only. No cortical layer was 

 found in my specimens. 



The branches (Fig. 265) are found in the axils of the tricho- 

 blasts pushed to the left side of them as drawn by FALKENBERG in 

 ENGLER und PRANTL, Nat. Pflanzenfam, I Teil, Abt. 2, p. 439, 



