68 



Jan. 1906] Cultures of Uredineae in 1905 17 



sown on Erysimum asperum, Sophia incisia, 17 Lepidium Virgini- 

 cum, and Bursa Bursa-pastoris, with success in each case. The 

 sowing was made April 18, and spermogonia appeared on Eryisi- 

 mum and Sophia April 25, Lepidium April 26, and Bursa April 

 27, while aecidia were observed on all by May 8. The aecidia 

 develop with considerable difficulty on Bursa, and Rev. Bates 

 writes that they are not common or abundant in the field on 

 this host. On Lepidium they also start with less ease than 

 on the other species, but under good conditions grow well. 18 



14. Puccinia poculiformis (Jacq.) Wettst. Teleuto- 

 sporic material on Agrostis alba, sent from Ithaca, N. Y., by 

 Mr. Jackson, was sown on Berberis vulgaris April 13, and 

 showed numerous spermogonia April 22, with abundance of 

 aecidia May 4. 



15. Puccinia Sorghi Schw. The work of last year, 19 in 

 which only aecidia were used, was verified this season by sowing 

 teleutospores. The material was obtained in Lafayette from an 

 early garden variety of sweet corn. It was sown April 17 on 

 Oxalis cymosa (the common wild wood sorrel of the region), 



O. Ortgiesii (a yellow-flowered greenhouse weed), O. , 



(a tuberous pink-flowered form of greenhouses), and O. Bowiei 

 (a pink-flowered form with large flowers and leaves, also grown 

 in greenhouses.) All remained free, except O. cymosa, which 

 showed numerous spermogonia on April 2J, and aecidia oh May 

 5. A second sowing was made May 1 on O. cymosa, O. Origiesii, 

 O. Bowiei, and O. corniculata (growing out of doors over a grass- 

 covered conduit for steam pipes), and again all remained free ex- 

 cept 0. cymosa, which gave spermogonia May 8, and eacidia May 

 14. It is not apparent why no infection should occur on the four 

 hosts other than O. cymosa, but there is no reason to suppose 

 that it was due in any degree to lack of vigor or suitable con- 

 ditions. 



The aecidiospores raised in the first trial above were sown 

 May 6 on seedlings of the yellow dent field corn variety of Zea 

 Mays, and in a week, May 13, showed uredospores, which 

 increased in abundance until teleutospores were observed June 15. 

 The uredospores from this culture (on yellow dent corn) were 

 sown May 16 on small plants of garden sweet corn, and gave 



"This is probably not the correct name of the plant used for the 

 cultures. It is, however, the name also used last year for the trial host, 

 which is the common species of Sophia in this region, and the error in 

 determination is due to the confusion existing in the current manuals. 

 The species is also different from the one on which the fungus was col- 

 lected last year in Nebraska by Rev. Bates (Jour. Mycol. 11: 116. 1905), 

 and that is also incorrectly named. But for the sake of simplicity the 

 name 6*. incisa will be used in this article for both species. 



"For previous cultures see Bot. Gaz. 35:19. 1903; and Jour. 

 Mycol. it: 54. 1905. 



"Bot. Gaz. 38:64. 1904. 



