A Disease of Currant Canes. 



35 



13 



stems. By October first, many of the branches had produced large numbers 



of the fruit-bodies with mature spores (Fig. 3, c). These resembled in 



nearly every detail the 

 specimens of Pleon- 

 ectria bcrolincnsis, 

 Sacc.in Ellis and Ever- 

 hart's North American 

 Fungi, No. 470. 



The perithecia are 

 minute, smooth, 

 spherical or p e a r- 

 shaped bodies, and are 

 usually borne in clus- 

 ters closely crowded 

 together. The color is 

 brick -red or reddish- 

 brown, bright when 

 the plants are fresh, 

 but duller when dry. 

 Each cluster is usually- 

 seated upon a more or 

 less distinct stroma, 

 but seldom, if ever, is 

 this a cushion of Tu- 



bercularia. Most of the specimens examined seem to be nearly sessile upon 



the wood, but an evident stroma is shown in Fig. 13. The clusters originate 



beneath the bark, but as they 



grow older and larger, they 



break through and appear on 



the surface, bordered by the 



ruptured edge of the epidermis. 



Occasionally, several clusters are 



joined side by side, forming a 



ring extending nearly around 



the stem. In some instances, 



when the bark had been torn 



away, the perithecia are not 



clustered, but entirely distinct 



and superficial on the wood. In 



such cases there is no evidence 



of an underlying stroma, cer- 

 tainly none of Tuberciilaria. 



When fresh the perithecia are 



swollen out and nearly spherical; 



but when old and dry the apical 



Lo7igitudinal seciion of a cluster of perithecia 

 of Pleonectria. 



14. 



Longitudinal section of a single peri- 

 thecium of Pleonectria. 



