144 Mycologia 



Aecidium Allenii Clinton 

 I. On Lepargyrea canadensis (L.) Greene (15505). 



Allodus Palmeri (D. & H.) Arth. 



I, iii. On Penstemon ellipticus Coult. & Fish. (16759). 



Calyptospora columnaris (A. & S.) Kuhn 

 On Pseudotsuga mucronata (Raf.) Sudw. (16902). Dr. Arthur states 

 that this rust has not been reported previously upon Pseudotsuga. It occurs 

 usually upon species of Abies. 



Coleosporium ribicola (C. & E.) Arth. 



II, III. On Ribes lacustre (Pers.) Poir. (15903). 



Coleosporium solidaginis (Schw.) Thiirn. 

 II. On Solidago concinna A. Nels. (16915). ii, III. On Aster meritus 

 A. Nels. (18686). III. On Aster Fremontii (Torr. & Gray) Gray (18425), and 

 Aster conspicuus Lindl. (16935). 



Cronartium Comandrae Peck 

 On Comandra pallida A. DC. (15944). 



Gymnosporangium Betheli Kern 

 I. On leaves of Crataegus Douglasii Lindl. (17844). 



Gymnosporangium germinale (Schw.) Kern 

 On fruit of Crataegus Douglasii Lindl. (174 16) and Amelanchier alnifolia 

 Nutt. (17007). 



Gymnosporangium juvenescens Kern 

 I. On leaves of Amelanchier alnifolia Nutt. (15597). 



Gymnosporangium Nelsoni Arth. 

 I. On leaves of Amelanchier alnifolia Nutt. (17743, 17425, 15159) and 

 Sorbus sitchensis Roem. (16533, 18449, 18643, 17034). Almost every plant of 

 the mountain ash had rusted leaves. The yellow spots on the leaflets are con- 

 spicuous in early summer, but no aecia were found in 1919 until July 28. 



Hyalopsora Cheilanthes (Peck) Arth. 

 On Cryptogramma Stelleri (Gmel.) Prantl (17144). 



Melampsora albertensis Arth. 

 ii, III. On Populus tremuloides Michx. (18732). Seen only about Belton, 

 although aspens are abundant on the east slope of the Park. 



Melampsora arctica Rostr. 

 II, iii. On Salix Scouleriana Barr. (18485). 



