33 



freqxiently 'become entangled aiaong neighlDoring filaments of 

 the same plant, tlms binding the lov/er parts of the fil- 

 aments more closely together and rendering them less easily 

 torn apart (fig. 50). This is especially true of the an- 

 theridial plants, in which the rhizoids are very richly 

 developed. 



After the rhizoids "become a.ttached, new shoots may 

 arise from tliem in the same way that lateral branches c.rise 

 from tlie vegetative cells (fig. ). 



Tendrils have been known in the red algae since AGARDH 

 (*80) fir!3t described them in Hypn ea , I'l^xh odea , Rhabdonia , 

 and other genera. SETCHELL ('96) described tendrils in 

 laizr e ncia and Cystocloni um, and stated that they may also 

 serve for vegeta.tive proiiag3.tion. ITOKDHAUSEIJ (*00) de- 

 scribed tendrils in Kypnea, Sp ;rridia , 8.nd Uitophyllum and 

 showed that new plants may arise from root tendrils in 

 Hvjmea. 



A process of regeneration occurs in the filament, v/hen, 

 as is often the case, one of the old cells perishes. Con- 

 tinuity of the filament is r^^Sstablished in the following 

 way. An outgrowth from the cell ne>:t above pushes tlirough 

 the intercellular i>ore, and grows down into the cavity of 

 the dead cell. The outgrowth is a tube, similar in appear- 



