Arthur and Kern: North American Peridermium 119 
On Pinus rigida Mill., Connecticut {Bishop ; Clinton , S. Man- 
chester, June 6, 1906, used for successful cultures on Solidago by 
the collector; Thom); Delaware ( Jackson , Seaford, June 4, 
1908) ; Pennsylvania ( Buckhout ; Orton & Adams) ; Massa- 
chusetts ( E . T. Bartholomew in Barth. N. Am. Ured. jio; 
Cummings & Seymour in Seym. & Earle, Econ., Fungi 223 ; 
Underwood 2862) ; New Jersey ( Pennypacker in Ellis & Ev. 
N. Am. Fungi 2222, Shear) ; New York ( Sirrine ; Whetzel & 
Reddick, Junius Swamps, May 25, 1906, Reddick , same locality, 
June 1, 1907; North Carolina ( Marr ). 
Type collected at Sudbury, Massachusetts, on Pinus rigida, 
June 7, 1891, L. M. Underzvood 2862. 
Distribution: From Massachusetts and central New York 
southward to central North Carolina. The telial stage is known 
on Solidago Aster, and allied genera, almost throughout North 
America, and eventually aecial collections are likely to be taken 
over a far greater range than here indicated. 
The most interesting development in connection with this spe- 
cies is the proof of its relationship to Coleosporium Solidaginis 
furnished by Clinton’s cultures. This seems to be the only foli- 
icolous species where the spores show any tendency to a smooth 
area after the style of the caulicolous species. This feature is not 
always discernable and was probably over-emphasized in our 
previous description. The range is here extended to western New 
York and southward into North Carolina. 
The repeating spores of the sporophytic stage enable the species 
to maintain itself in regions where pines do not occur, as they 
often are either produced or remain viable throughout the winter, 
and start infection in spring without intervention of aecia. 
7. Peridermium gracile Arth. & Kern, Bull. Torrey Club 
33:417. 1906 
0. Pycnia 190-350 ^ broad by 0.5-0.75 mm. long, low-conoidal, 
60-75 M high. 
1. Aecia flattened laterally, 0.5-1. 5 mm. long by 1-1.8 mm. high ; 
peridial cells broadly ellipsoid in face view, 23-29x30-45 g, over- 
lapping, the side walls 4-5 n thick, the inner wall rather finely and 
closely verrucose with uniform papillae; aeciospores ellipsoid, 18- 
