222 



Mycologia 



both in the discussion of his • morphological studies and his cul- 

 tural reports, cited above, that there are two species of Uromyces 

 on Spartina, are confirmed. The aecial form of U. Spartinae 

 Farl. occurs on Steironema ciliatum and 6^. lanceolatum, and the 

 aecial form of U. acuminatiis Arth. is yet unknown, although 

 field observations made by Mr. Guy West Wilson indicate that 

 it may occur on Polemonium reptans. 



15. Gymnosporangium sp., on Juniperus virginiana L. col- 

 lected at the Santee Canal, near Monks Corners, S. C, by Mr. F. 

 D. Kern, was sown March 24 on the leaves of Crataegus punc- 

 tata, Amelanchier erecta, and Cydonia vulgaris, with no infection. 

 On April i it was sown again on the same three species and on 

 Mains coronaria, with no infection. It was sown again April 14 

 on Crataegus sp., and Malus Malus, still with no infection. On 

 April 26 a sowing was made on Crataegus coccinea and Pyrus 

 communis (Kiefer's Hybrid), and on May 14 a further sowing 

 on Crataegus cerronis, Aronia arhutifolia, Sorhus americana and 

 Porteranthus stipulatus, wholly without infection. 



The failure to secure infection, although sowings were made 

 on all the genera known to harbor aecia of the Gymnosporangia 

 in the eastern United States, was probably due to the maturity of 

 the leaves, or to some accident. It is certain on morphological 

 grounds that this cedar rust is not a form at present recognized 

 under estabHshed names. The rust produces large brown sori, 

 often in series, extending along the bark of the larger branches. 

 It has somewhat the general appearance of Gym. nidus-avis, 

 causes a similar swelling of the branches, but differs in having 

 prominently projecting sori, even before gelatinization, which are 

 much roughened on the surface. 



Successful cultures supplementing previous work: The 

 following species of rust were successfully grown and the facts 

 supplement those obtained from previous cultures in this series 

 or those recorded by other American or European investigators. 

 In a number of cases the data here presented materially extend 

 the previously available knowledge regarding the several species. 



I. PucciNiA Peckii (DeT.) KeUerm., on Car ex lanuginosa 

 Michx., collected at Red Cloud, Neb., by Rev. J. M. Bates, was 



