226 



Arthur: Cultures of Uredineae G7 



From Care x crinita, St. Anne de Bellevue, Quebec, sown May 8, showing 



pycnia May 16, and aecia May 24. 

 From Carer arctata, St. Anne de Bellevue, Quebec, sown May 8, showing 



pycnia May 22, and aecia May 27. 

 From Carex tenuis, St. Anne de Bellevue, Quebec, sown May 13, showing 



pycnia May 22, and aecia May 27. 



In the report of cultures for 1910 7 the status of the name P. 

 albiperidia, as representing a distinct species of Carex-Ribes 

 rust, was discussed, but left somewhat unsettled. It was, how- 

 ever, thought to belong to a form possessing urediniospores with 

 one basal pore, while the more common form on the same hosts, 

 P. Grossulariae, has urediniospores with three equatorial pores. 

 Subsequently Mr. C. R. Orton went over the material involved, 

 including the type of P. albiperidia, and concluded 8 that 'this 

 name should be a synonym of P. Grossulariae, and that the form 

 having urediniospores with one basal pore is entitled to be con- 

 sidered a distinct species to which he gave the name P. uniporula, 

 a species correlated with Uromyces uniporulus Kern, the aecia 

 of both species being unknown. 



To gather further information I have had single sori removed 

 from the type collections of both species of Puccinia involved, and 

 have had the spores of each sorus separately counted by using a 

 mechanical stage. The results are given in the following table. 

 The type of P. albiperidia is on wintered-over leaves, having 

 been gathered April 30, 1901, at Lafayette, Ind., and provides few 

 urediniospores, while that of P. uniporula was gathered August 

 20, 1910, at London, Ontario, and gives a fair number of uredinio- 

 spores. Both types are on Carex pubescens. As usual when ure- 

 diniospores are taken from mature telial sori, many of the spores 

 are not in condition to show the pores. When the pores could not 

 be ascertained with fair certainty, even after using lactic acid or 

 chloral hydrate with iodine, the spores have been classed as un- 

 certain. It was also necessary to take the number of cells in the 

 teliospore into account, as Carex pubescens also bears Uromyces 

 uniporulus, chiefly distinguishable by the teliospores. 



7 Mycol. 4: 13-15. 1912. 



8 Mycol. 4: 200, 201. 1912. 



