OF BUCKLEYA QUADKIALA, B. ET H. 37 



the wood of the host, grows laterally and tangentially along the 

 cambium ring of the latter, imitating the marginal growth. We 

 must, however, consider that this growth is confined only to the 

 period of development, and no secondary growth of the margin is 

 observed. Applying these features found in Buckleya to Osyris, 

 which in every respect resembles the former, it is highly probable 

 that the marginal growth of the sucker in Osyris occurs during 

 its primary growth only, and that, on the other hand, the 

 secondary growth concerns its thickness only. 



Solms-Laubach has described in the haustorium of Santalum 

 album that the sucker extends like a fish-tail : " Der colossale 

 Saugfortsatz hat durch seine beiden sich zwisehenschiebenden 

 Lappen die Rinde zu 3 /.± vom Holz heruntergeschält, sie zwischen 

 deren Oberseite und die Ansatzfläehe einpressend. m) 



This way of extention of the sucker I could confirm in 

 Buckleya, and in my case the degree of extention seems to depend 

 upon the character of the host and, even in the same species of 

 the host, upon the conditions of its growth. It is doubtful 

 whether this extention in Santalum will continue during its 

 further growth ; fur, from the description of Solms-Laubach, it 

 may be inferred that the haustorium investigated by him was only 

 one year old, i. e., he could observe its structure only in its 

 primary stage. If I am not mistaken, the sucker would not keep 

 such a form for a long time, 2 ' but it will grow in thickness in 

 the same manner as Buckleya and take a similar form (Compare 

 Figs. 9, 10). 



Though our knowledge of the structure of the haustorium of 

 Osyris and Santalum is in some respects still insufficient, the 



1). Foot-note by Solms-Laubach in Scott's loc. cit. p. 149. 



2). From analogy it way be considered that the haustoriurn of Santalum may maintain 

 a perennial growth. 



