in njoo. 



Arthur: Culti Uredineai: in njor) 215 



erto undetected species of the same genus, also inhabiting the 



red cedar, as well as other culture material. The locality is an 

 interesting one, and deserving of further uredinological explora- 

 tion. 



We spent two days at Aiken, in the highlands of South Caro- 

 lina, where Mr. Ravenel lived after the Civil War had swept 

 away the family wealth. It was here that the work on his 

 Fungi American! Exsiccati was done. We wished especially to 

 obtain further knowledge of Roestclia hyalina, a highly charac- 

 teristic rust on Crataegus which is only known from Ravenel's 

 original collection made at Aiken and distributed in 1878 as no. 

 37 in his Fungi Americani. We hoped to find a telial form 

 from which the Roestclia could be grown, as we had done last 

 year in the similar case of an isolated Rocstelia from central 

 Kentucky. 3 Unfortunately we failed to obtain any trace of the 

 sought for rust, although we secured other culture material. 



During the week following my associate, Mr. Kern, joined a 

 company from the Missouri Botanical Garden at St. Louis, in a 

 day's collecting along the bluffs of the Mississippi River south of 

 St. Louis, securing culture material chiefly of grass and sedge 

 rusts. 



Another brief but important trip was made by Mr. Kern the 

 first week in June to Leland in the northern part of the southern 

 peninsula of Michigan, about 300 miles north of Lafayette, Ind. 

 This was in consequence of observations made by Mr. Kern and 

 the writer in that locality during the previous September. Horn- 

 like aecia on Sorbus, Aroma and Amclanchicr are quite common 

 in the northern United States and Canada, and often occur in 

 herbaria, usually under the name Roestelia cor nut a. Morpho- 

 logical studies made by Mr. Kern convinced him some time ago 

 that the similar aecia on the three host genera belong to three 

 independent species of rusts, and since then we have been trying 

 to secure suitable material for cultures. Last year we were able 

 to show that telia of Gymnosporaii^ium cornutum on the branches 

 of Juniperus Sibirica produced the aecia on Sorbus, and that 

 telia of G. Davisii on the leaves of the same host produced the 

 aecia on Aronia* In searching in northern Michigan for clues 



3 Mycol. 1 : 226. 1909. 



* Mycol. 1 : 240-242. 1909. 



