Arthur: Cultures of Uredineae 
67 
From Carex crinita, St. Anne de Bellevue, Quebec, sown May 8, showing 
pycnia May i6, and aecia May 24. 
From Carex 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^ 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. Grossiilariae, has urediniospores with three equatorial pores. 
Subsequently Mr. C. R. Orton went over the material involved, 
including the type of P. albiperidia, and concluded® that this 
name should be a synonym of P. Grossiilariae, 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 uniporulns 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. 
r Mycol. 4: 13-15. 1912. 
* Mycol. 4: 200, 201. 1912. 
