OF BUCKLEYA QUADILIALA, B. Eï H. O 



of this plant was first announced by Professor Biiikai in his book 

 on plant diseases written in Japanese. 11 This discovery led me 

 to make somewhat detailed studies of this plant. First of all, I 

 intended to determine its hosts by means of a close examination 

 of its roots, while I was obtaining numerous haustoria for ana- 

 tomical study. The plants thus determined as hosts till now are 

 as follows : — Gryptomeria japonica, Abie* firma, Cha/na'cypcris 

 obtusa, Querem glandulifera, Carpinus japonica, 0. yedoensis, 

 Fagus japonica, Rhododendron sinense, Alnus firma, Fraxinus 

 longicuspis, Lespedeza Buergeri, Ilex macropoda and Stachyurus 

 prœcox. 



Besides I was struck with the remarkable phenomenon that 

 the plant seems to be able to select its host, for in a certain 

 region where several kinds of conifers grow side by side, I have 

 always failed to find any Buchleya where pine-trees grow, while 

 on the other hand it is found abundantly and in a flourishing 

 condition where other conifers as such Gryptomeria, Abies, or 

 Ghamœcyparis stand. Even where foliage trees and Abies grow 

 mingled together, Buchleya is found most abundantly near the latter 

 and in such cases a close examination always shows that Buchleya 

 is parasitic on the Abies. My culture experiments with the seed of 

 Buchleya showed that all the plants used were capable of being 

 hosts, as, for instance, all the seedlings of Buchleya developed 

 haustoria as soon as their young roots came in contact with those 

 of other plants such as Quercus ylauca, Podocarpus sinensis, 

 Torrcya nucifera, etc., and even with those of Pinus Tkunbergii, 

 though this fact seems to be contradictor}^ to what had been 

 observed in nature. 



The development of the parasite in the cases of various hosts, 



1). SuiRAI, riant Diseases 1894 (In Japanese). 



