Kern: Studies in the genus Gymnosporangium 509 



present no roestelial form recognized from this region which may 

 be associated with this species. 



Gymnosporangium Libocedri (Henn.) comb. nov. 



In 1890 H. Mayr used the combination Gymnosporangium Li- 

 bocedri in his work " Die Waldungen von Nordamerika " but he 

 did not describe the fungus he referred to in such a way as to estab- 

 lish the name. In 1 898 P. Hennings described in Hedwigia 37 : 

 271 a species of rust which he evidently took to be the same as 

 the one Mayr had referred to but named it Phragmidium Libocedri- 

 Sydow was the next to study the Libocedrns rusts and a full account 

 ofhis observations is given in the Annales Mycologici 2 : 28. After 

 considerable investigation he came to the conclusion that Hennings' 

 name should be considered a synonym of Mayr's and that they re- 

 ferred to a species distinct from one that he had at hand which had 

 been recently collected in California by E. B. Copeland. He there - 

 °re proposed the name Gymnosporangium aitrantiacum for 

 s pecies. Later on Sydow obtained some of Hennings' material and 

 ade out that the form described as Phragmidium Libocedri was 



his 



also 



V 



The writer has 



examined original material of both these collections and finds 



s to be the case. The older specific name of the species is Libo- 

 1 anc l since Mayr's name is a nomen nudum there is nothing 



prevent 



& 



35 1. "^ * 



le re proposed. Sydow's specific name aitrantiacum could not 



Chevalli 



* 



,e r, Fl. Env. Paris 1 : 424. 1826. 



Telia appearing on galls. 

 Gal 's globoid or reniform. 



Key to the telia 



I 



T \ Sabina virginiana) 249. 1893.) 



1 eha terete. 



Telia cylindrical 



or cylindrical- "^ G. Juniperi-virginianae 



acuminate, Schwein. 



golden-brown... Sabina virginiana > (Schr. Nat. Ges. Leipzig 



J 1:74. 1822.) 



