76 

 Aira 

 Couidia froin caespitosa prodnce infection on Molinia 



coerulea, but do not infect Spanish double-rye. 

 It infects: Poa amna 

 It does not infect: 



Aira caespitosa 

 Arrhenatherum elatius 

 Bromus e'rectus 

 Hordeum sativum 

 lolium italicum^ 

 " perenne 

 "' rigiduin 

 Panicum miliaceum 

 Poa alpina 

 Poa caesia 

 Poa cenisia 

 These results indicate that the Claviceps of Poa annua has only one host 

 said that it does not pass to the typicail host of C. purpurea ojS rye. Its 

 host is not infected by any of the other Claviceps sp. or by C. •purpurea 

 biologic races as sho^vn in prejrious experiments. 



In his paper (250) Stager considered this fungus as a dis- 

 tinct biologic race of C. purpu rea of rye, but in his later paper, (252), 

 after careful morphologicaj. study of its ascigerous stage, not irade before 

 he considered it as a biologic race of C. ciicrocephala . o f Fhaamites 

 oonmunis . and called it Clavicer)s microcenhala Tulasne, spez . bioloaica 



Poae. 



Infection experiments with CJLaviceTis of Sesleria 



coerulea from Twaun Switzerland (248) 



