91 



VEGETATI VE iTLTLTI PLI CATI ON . 



Griff ithsi a Borne ti ana ina.y reproduce itself ve(;eta- 

 tively in tv/o v/ays: first, by accidental isolation and 

 subsequent crov/th of single cells or small pieces of a 

 filament; second, by tlie production of new plants from ten- 

 drils. 



The first method of propagation v.as described for 

 G. Corallina by JAITCZEV^SKI (*76) and mentioned as occurring 

 in G. Bo rne tiana oy TARLOW (•79). More recently TOBLER 

 ('03, *03a, *02) has called attention to the fact that 

 Griff ithsia , Bornetia , Dasya , Polysixhonia , and other forms 

 may reproduce themselves under laboratory conditions by a 

 l)rocess of fragiaentation of the filaments and grov/th of 

 the resulting portions into nev7 plants. In G. Borne tiana 

 this process taJces place not rarely in nature. In such 

 cases the isolated cell produces a rhizoid from its base 

 and a new growing point from its apex (figs. 151,157). 

 The rhizoid is formed norraall;/ in the raa.nner already de- 

 scribed. The apical cell is produced b;-- the accumulation 

 of protoplasm at the tip of and subsequent unequal division 

 of the parent cell in tiie usual me.nner. 



Vegetcitive propagation by means of tendrils lias heen 

 described on page J3 . 



