SPEEMOGONES. 29 



idea of tlie nature of tlie bodies we are attempting 

 to describe. During the past summer we have 

 noticed very similar orange spots on leaves of the 

 berberry containing spermogones on both surfaces, 

 and these appeared before any cups had been found 

 on that plant. In this instance no cups were pro- 

 duced from the spots on the leaves examined, and 

 which were carefully noticed at intervals until they 

 withered and fell. 



In some instances, as in Bcestelia cornuta, which 

 is found on the leaves of the mountain-ash, the 

 cups are produced on the lower, but the spermo- 

 gones almost exclusively on the upper surface. 



The spermogones of Peridermmm Pini are white, 

 few in number, and are developed, not only in the 

 spring, but sometimes reappear in the autumn upon 

 the same leaves that produced them at the com- 

 mencement of the year. 



In such instances as those of the ZScidium of the 

 spurge, and also the goatsbeard, in which the 

 cluster-cups are arranged in no appreciable order, 

 the spermogones are scattered amongst them, and 

 even in some instances appear on different leaves. 

 The spermogones are common on the wood spurge 

 in spring, scattered over both surfaces of the leaves 

 before the cluster-cups make their appearance, and 

 gradually these latter are developed amongst them, 

 commencing from the apex of the leaves and pro- 

 ceeding in the order of their development towards 

 the base. In this instance the spermogones are 



