No. 450.] STUDIES Oj\ THE FLAXT CELL. 



portions of ccenocytes, generally (li\ i(lc cxicnsix- 

 ductivc periods and always through r Avrrv/.v ' <'ii- 

 however, the treciuent cooperation ot" vai iu.ks whic 

 the protoplasm in the same manner as the clea 



fnr iT/l formation and c}ca:a^. hy ./// l^laUs heii 

 very highly developed prot()])lasmir activities. 



A simple example of ch-nvdi^r hy l OiLstru tim, 

 such an alga as Cladoi)hora. The pioci.s.s con 

 ing out of a ring of cellulose tr(.m the side \ 

 cavity. The outer plasma membrane tornis a 

 the two surfaces opposite one another (see I 

 wall is laid down between these. Spirog) ra 

 precisely the same manner as Cladophora witl 

 that the new wall finally cuts through the i)r< 

 that connect the daughter nuclei. These stran 

 tain spincfle fibers (Van Wisselingh, : 02 ) which 

 the plasma membranes forming the cell wall. ; 

 Another illustration of rAvrrv/.-r byrousfru fioii v. 

 formation of gametes of moulds ( Sporoduua 

 tion of conidia (Krysiphe:e ), both processes ha 

 by Harper, '99, p. 506. In these cases a ( lea 

 ceeds from the surface inward and divides the 

 partition wall of cellulose is formed later betw 

 plasma surfaces. The only differences hetwc 

 above described are that in the first tonus the 



