194 



Arthur: Cultures of Uki i\ i<>m 2~) 



perus sibirica Burgsd., was sent by Mr. E. Bethel, from Boulder, 

 Colo., and sown April 7, on the young fruit of Pyrus communis, 

 which fell off before time for infection to show, and also on the 

 leaves of Amelanchicr crccta and Crataegus punctata. On the 

 Crataegus a few pyenia showed April 15, but no aecia developed. 

 On the Amelanchicr numerous pyenia appeared April 13, and 

 many aecia April 25. 41 



28. Gymnosporangium nidus-avis Thaxt., on Junipcrus vir- 

 giniana L., was sent from Washington, D. C, by Dr. Haven 

 Metcalf, and sown April 16, on leaves of Cydonia vulgaris, giving 

 a few pyenia May 2, and also on the young fruit of Amelanchicr 

 vulgaris, giving a few pyenia first noticed May 24. In both 

 instances no further development occurred. 4 - 



29. Gymnosporangium cornutum (Pers.) Arth.. on Juni- 

 perus sibirica Burgsd., sent from Palmer Lake, Colo., by Mr. E. 

 Bethel, was sown May 18 on Sorbus americaua, Aroma arbuti- 

 folia, and Amelanchicr erecta. Infection was secured only on the 

 Sorbus, the pyenia being produced in abundance but tardily, and 

 the date was not taken. The plant did not thrive, and no aecia 

 matured, although on August 16 they were showing. 43 



30. Gymnosporangium Davisii Kern, on Junipcrus sibirica 

 Burgsd., sent by Dr. J. J. Davis from Wind Lake, Wis., was sown 

 May 3, on Aronia arbutifolia, A. nigra, Sorbus amcricana, Ame- 

 lanchicr crccta and Crataegus tomentosa, without results. Another 

 sowing was made May 12, on the two species of Aronia, which 

 resulted in a few pyenia on A. nigra, showing May 2J. Still 

 another sowing on A. arbutifolia was made May 18, and gave a 

 few pyenia May 25. In neither instance did aecia develop. 44 It 

 is probable that the conditions under which the cultures are made 

 in the greenhouse are not favorable for this rust. 



31. Gymnosporangium Betheli Kern, on Junipcrus scopu- 

 lorum Sarg., sent by Mr. E. Bethel from Boulder, Colo., was sown 



41 For previous cultures see Jour. Myc. 14: 18. 1908: and Mycol. I: 239. 

 1909. 



42 For previous cultures see Jour. Myc. 14: 19. 1908; and Mycol. 2: 230. 

 1910. 



43 For previous cultures see Mycol. 1: 240. 1909; and 2: 230. 1910. 



44 For previous cultures see Mycol. 1: 241. 1909, where an error was made 

 in assuming that this species occurs in Europe; see also Mycol. 2: 216. 1910. 



