402 



UREDINEAE. 



G. Ellisii Berk. On Chamaecyparis thyoides. The aecidial 

 stage on Pyrus Mains and P. arhutifolia. 



On red cedar {Junipencs virginiana) : 



G. macropus Lk. The aecidia and pycnidia occur on Pyrus 

 Malus, P. coronaria, P. arhutifolia, Cratct^us tomentosa, C. 

 Bouglasii, and Amelanchier canadensis ; they are known as 



Pig. 237.— Spores of 

 Gym. hiseptaium. (After 

 Woenile.) 



Fig. 23S.— Spores of 

 Gym. Elliiii. (After 

 Woernle.) 



Fig. 2S9.— Spores of 

 Gym. maoropxis. (After 

 Woernle.) 



Poestelia pirata. This is one of the commonest causes of 

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

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

 by Sanford.^ 



6. clavipes Cooke et Peck, occurs on Jiniipcru.s communis. 

 Its aecidia and pycnidia are found on Pyrus Malus, P. arhuti- 

 folia, and Amelanchier canadensis. 



' Sanford, Annals of Botany, i., 1S87. 



