357 



necessary to determine its life history with certainty. It seems prob- 

 able that the uredinia are able to carry the fungus over the winter. 



92. PucciNiA TRiTiciNA Erikss. Ann. Sci. Nat. VIII, 9:270. 1899. 



On Poaceae: 



Triticum vulgare L., Newark, July 2, 1907, (1882), June 21, 

 1907, (1662). 

 This is the common leaf rust of wheat found in all parts of the 

 United States as well as in most sections of the world where wheat is 

 cultivated. The life history is unknown. It is a sub-epidermal form and 

 is moi'phologically very similar to leaf rusts on wild grasses commonly 

 referred to P. tomipara and P. Agropyri (P. clematidis (DC.) Lagerh.), 

 having aecia on Thalictrum, Clematis and other Ranunculaceous hosts. 



93. PUCCINIA URTICATA (Lk.) Kern, Mycologia 9:214. 1917. 

 Aecidium Urticae Schum. Enum. PI. Saell. 2:222. 1803. 

 Caeoma iirticahivi Link, in Willd. Sp. PI. 6': 62. 1825. 

 Puccinia Urticae Lagerh. Mitt. Bad. Ver. 2:72. 1889. (Not P. 



Urticae Barcl. 1887.) 



On Cyperaceae: II, III. 



Carex stricta Lam., Seaford, April 23, 1908, (2029). 



Magnus in 1872 (Vehr. Bot. Ver. Prov. Brandbg. 14:1872.) first 

 showed that Aecidium Urticae on Urtica dioica was the aecial stage of 

 P. Caricis (Schum.) Rebent. on Carex hirta. Many other European 

 investigators have repeated this work with additional hosts, including 

 Schroeter, Cornu, Plowright, Ed. Fischer and Klebahn. A general review 

 is given by Klebahn (Wirtsw. Rostp. 293. 1904). 



In America Arthur (Bot. Gaz. 29:270. 1900) was the first to con- 

 duct successful cultures. He obtained the development of uredinia on 

 Carex stricta by inoculating with spores of Aecidium Urticae. 



Later cultures (Jour. Myc. 8:52. 1902; Bot. Gaz. 35:16. 1903) 

 showed that aeciospores developed on LTrtica gracilis following sowings 

 of teliospores from Carex stricta collected in Nebraska and C. riparia 

 from Iowa. In 1905 (Jour. Myc. 12:15. 1906) teliospores on C. stipata 

 from Indiana and from C. aquatUis collected in Colorado, were used in 

 successful cultures on U. gracilis. In 1907 (Jour. Myc. 14:14. 1908) 

 Arthur again conducted successful sowings of teliospores from Indiana 

 material on C. stipata and from Nebraska material on C. riparia. In 



