76 



intercellular spaces, sending out one or two rod-like haustoria into the 

 cell-cavity of each cell. (PI. IV", fig. 4.) 



The close application of the haustoria on the nuclei of the cells of the 

 diseased tissue is also to be observed in this case, as was first noticed by 

 Rosen in the haustoria of Puccinia asarina. 



The spermogonia of this fungus are formed in the month of January 

 in the intercellular species between the corky bark and the cortical paren- 

 chyma as flat continuous layers, 13 when large yellow drops of viscous fluid 

 of sweet taste loaded with an immence number of spermatia flow out from 

 the fissures of the cracked bark. 



This viscid drops of sweet taste are known by the name of Matsu- 

 mitsu 2) (Pine-honey) and are eaten by boys and girls when they happen 

 to fiud them. 



The aecidium fruit is developed in the month of April in the cortical 

 parenchyma, ten or more layers deeper than the spermogonia forming net- 

 like layers of irregular meshes as shown in PI. IV, fig. 1. 



In consequence of the formation of the spermogonia and of the 

 subsequent cracking of the corky bark, the pressure of the latter on the 

 inner bark greatly lessens and thus secures the formation of the aecidium 

 layers in the deeper tissues. 



From this cause also, the division of the cambium and the expansion 

 of the newly formed tissues take place in the diseased portion easier than 

 in the healthy portion, aud thus the abnormal developement of its wood 

 and bark is greatly facilitated. 



The pseudoperidium formed of torelably thick walled cells is colorless 

 and of very firm texture. 



One peculiarity which may be mentioned here in connection with the 

 aecidium layer is the postlike prolongations of the end of some medullary 

 rays, which penetrate the cortex and the aecidium layer so as to reach 

 and support the pseudoperidium and which also probably serve in lifting 

 up the overlying layers of the cortex (PI. IV, fig. 3) when the spores of 

 fhe aecidium layers are fully developed, they are set free by the rupture 

 of the pseudoperidium and come to the surface of the bark through its 

 fissures, and are dispersed by wind and rain in every directions. 



These spores, when they fall on the leaves of deciduous species of 

 Quercus, germinate and give rise to the mycelia which are destined to 



1) A character which does not exactly agree with that of the spermagonia of the 

 known species of Cronartium which nre hemispherical in form. 

 2. %®® &WM8Mffi, Vol. 1, Page 6. 



