402 



VllEDIXEAE. 



G. Ellisii I Jerk. On Chamaecyparis //<,//<> /-7,x. The aecidial 

 stage on J'l/ru* Main* and P. arbutifolia. 



On red cedar (Juniperus virginiana) : 



G. macropus Lk. The aecidia and pycnidia occur on Pt/rns 

 .Wains, P. corona riit , P. arliutifolia, Crataegus tomentosa, C, 

 ii\ and A //n/n/ir/iier canadensis: they are known as 



/ 



Fit;. 237. Spores of 

 Gym. bixc/itatwii. (After 

 Woernle.) 



Fio. 238. Spores of 

 Gym. Ellisii. (After 

 Woernle.) 



FIG. 239. Spores of 



ay ni. macropus, (After 

 Woernle.) 



Roestdia pirata. This is one of the commonest causes of 

 apple-rust and of the deformation known as " cedar apples " (Fig. 

 240). The anatomy of the latter structures has been described 

 by Sanford. 1 



G. clavipes Cooke et Peck, occurs on Jt'/i^>i',-//,s communis. 

 Its aecidia and pycnidia are found on Pyrus Mains, P. arbuti- 

 folia, and Amelanchier canadensis. 



1 Sanford, Aiuial.i of Botttin/, i., ]S.s7. 



