In order to 

 for reference than they a 



: of the data of distribution ha 1 

 form (tables I, II and III). 



TABLE I.— Distribution of the Sp 



:on of the Data of Distribution 

 }f the facts to be discussed more avail. 

 Dnograph of Pai 





Telial Hosts 





Sl^ 



~ 



Africa 



Order 



Family 



Genus 



Species 



giers, 







Ts P ab"na 



21 





(Central) 



- 



Pinales 

 (Coniferales) 



JU ace P ar 



§ Oxycedrus 

 Chamaecyparis 



Heyderia 

 Cupressus 



4 



;; 



(Jap'an) 

 (India) 



: 



Upon examination of table I, attention is perhaps first drawn 

 to the fact that the genus Gymnosporangium is known only in 

 North America, Europe, Asia, and northern Africa. This is a 

 case of host-limited distribution, the members of the family Juni- 

 peraceae being found only in the temperate zone of the northern 

 hemisphere, extending in some places to the verge of the tropics. 

 Also, most of the members of the family Malaceae, at least those 

 that serve as hosts for Gymnosporangium, inhabit only the northern 

 hemisphere. 



Certain additional facts must be presented in connection with 

 table I in order to bring out the essential features of the distri- 

 bution of the species inhabiting the genus Juniper us. There is 

 only i species which is known to inhabit both sections of the genus, 

 that being G. germinale, a North American species. Of the 20 

 species inhabiting only § Sabina, 17 occur exclusively in North 

 America, the remaining 3 in Europe, while I of the European species 

 is also in central Asia. With the species inhabiting § Oxycedrus, 

 the situation is quite different. Of the 6 species occurring exclu- 

 sively on this section, I is distributed in North America, Europe, 

 and northern Africa, 2 more are common to both North America 

 and Europe, 2 are known only in Europe, and I only in North 



