

502 



Kern : Studies in the genus Gymnosporangium 





ever, which may prove a possible exception to the foregoing state- 



There is but one collection of it and so little is known that 



ment. 



nothing positive can be stated but it seems probable that it should 



11 S ^ ' - . . __ • „~J U^ l^pfPfnpriniis With 



;porangium 

 Malaceae 





;p 



by teliospores having hyaline pedicels, usually of great M^;" 1 ** 



swell in moisture and often becom e gelatinized to form a je * I 



matrix in which the spores appear to be imbedded. 



in connection with the development of this stage are peculiar 4*r 

 tions which are usually produced either in the leaves or branche • 

 For the purpose of bringing together the data in , such a n»n 

 ner as to be of material assistance in the determination of spec 

 mens, a key, involving the more evident diagnostic c to* s ol 



the telia of the known North American speces, and >" dlcat ' n » 



hosts lor each one, is presented herewith. Preceding the** 



natory 



249. 1893 



notes are given 101 sunn- ui ...^ ~ r - » * . r^Hirps 



ture, important extensions in range, and other interesting feature 



which have been revealed in these investigations. 



Gymnosporangium bermudianum (Farl.) Earle, in eym. 



This is the most curious ot all me *F^ es of ^'^f^al 

 gium, being the only one which is not heteroe( ; ,0US small irreg u- 

 stage is a geniune Rocstelia, developing in the fall on ^ ^ ^ 

 lar, globoid galls, and is followed in the spring by te ia ^ ^ 

 galls. The telia are very inconspicuous and may 

 looked in the dried condition of herbarium specimens. 



Gymnosporangium Juniperi-virginianae Schwein. 



Leipzig 1: 74. l822 pl6: 



The name Gymn>sf>oragium macropus Link ( ^^ waS pU b- 

 128) is often used in referring to this species u mst bc 



lished in 1825, the one established by Schweimtz in 

 accepted as the valid name. 



