200 BROOKLYN BOTANIC GARDEN MEMOIRS 



of Mt. Jefferson or in Hood River County. About sixty collections 

 are recorded from the counties bordering on the coast, only a few of 

 which are from the southern coast counties. Less than three hundred 

 collections have been made in eastern Oregon, almost half of which 

 are from the mountainous region of the northeastern part. 



It will be seen from the above summary of the distribution of the 

 collections recorded that only a very small portion of the State has 

 been explored for this group of fungi. Much remains to be done, 

 particularly in southwestern Oregon and in eastern Oregon. The 

 mountains of the Coast Range have been explored only in Benton 

 County, where several collections have been made on Mary's Peak. 

 The coast counties also offer a rich field for the collector. The region 

 around Corvallis in Benton County is the only portion of the State that 

 can be said to have been carefully explored for rusts. Corvallis is 

 situated at the junction of the Willamette River and Mary's River 

 and lies in the edge of the foothills of the Coast Range. 



In spite of the fact that the exploration so far conducted is in- 

 adequate to furnish a very accurate idea of the rust flora of the State, 

 records for 220 species are brought together in the account which 

 follows. These occur on about 500 different host plants. In connec- 

 tion with the study of the collections 10 species have been found 

 which are believed to be new to science, 8 of which are described in 

 the following pages. A number of European species not previously 

 recorded for North America have also been collected in the State. 

 A large number of unrecorded host plants have been encountered. 



The number of species of economic importance found in the State 

 is worthy of mention. All of the grain rusts recorded for North 

 America with the exception of the corn rust {Puccinia Sorghi) are 

 known to occur in the State, including the recently discovered Puccinia 

 glumariim. All of the rusts troublesome to florist's crops in the 

 greenhouse, including Puccinia Antirrhini, are known to occur. The 

 Pacific coast rust of pears and quinces promises to become of con- 

 siderable economic importance. The large number of forest-tree 

 rusts found in the State offers an especially attractive field for investi- 

 gation. Many heteroecious species are known to occur whose life 

 history is not yet determined. The rusts occurring on Salix are 

 especially in need of investigation. 



In the notes given in connection with the account of the species 

 which follows, an effort has been made to summarize the available 

 information on the life history as shown by any culture work which 

 may have been conducted either by American or European authors. 

 Notes on the distribution in North America are given whenever it 

 was considered of sufficient importance. The genera are listed alpha- 



