56 



Mycologia 



geographical position, but more information is needed regarding 

 the races of the Uromyces before a full comparison can be insti- 

 tuted. Whether the aecia of the Uromyces ever occur upon any 

 family other than the Chenopodiaceae, as do those of the Puc- 

 cinia, yet remains uncertain, but it is confidently expected that 

 such will be the case. In any event there is every reason, except 

 that of nomenclatorial expediency, to consider Puccinia subnitens 

 and Uromyces Peckianus telial races of one and the same species 

 which in turn may be separable into geographical races in accord- 

 ance with their selection of aecial hosts. 



7. Uromyces Medicaginis Pass. The urediniospores from 

 plants of Medicago sativa L., carried over the winter in the green- 

 house, were sown March 8 on Medicago sativa, Trifolium pra- 

 tense, T. medium, and T. repens, producing infection only on the 

 first, uredinia showing March 22. A similar set of sowings was 

 made April 28 on other plants of the same four hosts, with sim- 

 ilar result, only the Medicago being infected, showing uredinia 

 May 12. The work of 1910 is thus confirmed.^^ 



8. Gymnosporangium Nidus-avis Thax., on Jimiperus 'oit- 

 giniana L., was sent by Dr. Frank D. Kern from Newfield, N. J., 

 and sown May 4 on leaves of Cydonia vulgaris, Malus coronaria, 

 Amelanchier erecta, and also on the fruit of the last. The only 

 infection was on the fruit of the Amelanchier, showing numerous 

 pycnia May 12, and aecia in great abundance May 24. Another 

 collection on the same host sent by Professor E. Mead Wilcox 

 from Lincoln, Neb., was sown May 11 on leaves of the same 

 three hosts, with infection only on the Malus, giving pycnia 

 June 2, but the leaves dying before aecia formed. 



9. Gymnosporangium clavariaeforme (Jacq.) DC., on Ju- 

 niperus sibirica Burgsd., was sent by Mr. E. Bethel from Lake 

 Eldora, Colo., and sown May 25 in the open orchard on fruits 

 of pears and apples, and in the greenhouse on leaves of Cydonia 

 vulgaris and fruits of Amelanchier erecta, with no results except 

 on fruits of Amelanchier, giving abundant pycnia May 31, and 

 very abundant aecia June 15.^^ 



"See Mycol. 4: 24. 1912. 

 For previous cultures see Jour. Myc. 2 : 230. 191 o ; and 4 : 25. 1912. 

 For previous cultures see Jour. Myc. 14: 18. 1908; Mycol. i: 239. 1909; 

 and 4 : 24. 1912. 



