131 



240 lOl Mycologia 



orons. On the second host abundant and characteristic aecia 

 were formed. 28 



19. Gymnosporangium Betheli Kern, on Juniperus scopu- 

 lorum, collected by Mr. E. Bethel at Eldorado Springs, Colo., 

 was sown May II, on Pyrus communis, with no infection, and on 

 Sorbus americana, and Crataegus sp., both giving numerous 

 pycnia, on the former host showing May 19, and on the latter not 

 seen until May 31, although probably appearing earlier. The 

 pycnia in both cases were followed by an abundance of charac- 

 teristic aecia, well formed by July 7.* 



20. Gymnosporangium Botryapites (Schw.) Kern, on Cha- 

 maecy parts thyoides (L.) B.S.P., collected by Mr. H. S. Jackson 

 at Newfield, N. J., was sown on Amclanchicr intermedia Spach, 

 May 18, giving an abundance of pycnia May 28. Although galls 

 followed the pycnia, no aecia were formed owing to the early 

 maturity of the leaves. This is the Gym. biseptatum Ellis. The 

 rather extended synonomy is given by Kern. 30 Inconclusive cul- 

 tures of this species were made by Dr. W. G. Farlow in 1877 and 

 1883. In 1886 Dr. Roland Thaxter 31 made cultures, and raised 

 both pycnia and aecia, repeating his work at a later date. 



21. Gymnosporangium cornutum (Pers.) nom. nov. Telia 

 on the branches of Juniperus Sibirica Burgsd. were collected May 

 19, 1908, by Mr. F. D. Kern and Mr. E. Bethel, at Palmer Lake, 

 Colo., and sown May 23 on Sorbus americana, giving an abun- 

 dance of pycnia June 1, followed by numerous aecia. A second 

 sowing was made on another plant of the same host May 25, with 

 equally successful results, the pycnia showing June 5. In both 

 cases the aecia were mature by August 10. A sowing May 25 

 on Mains Mains gave no infection. 



Although the horn-like aecia of this species are common and 

 often collected, this is the first time that the telia have been found 

 in America. The telia occur on the bark of the small branches, 

 and not at all or only rarely on the leaves. In Europe cultures of 

 this species were made by Oersted, of Denmark, in 1866, and an 

 account with excellent illustrations of both aecia and telia was 



28 For previous cultures see Jour. Myc. 13: 203. 1907; and 14: 18. 1908. 



29 For previous cultures see Jour. Myc. 14: 23. 1908. 



30 Bull. Torrey Club 35: 506. 1908. 

 81 Proc. Am. Acad. 22: 263. 1887. 



