286 botanical gazette. [ November, 



dant and very evident, tending to greater abundance on the 

 upper side of the leaves ; development late. This specimen 

 was collected at Deer Lod^e, in October, 1888. (6) On 



Oenothera albicauhs Nutt. It develops early. The only spe- 

 cimen I ever saw was sent me by Mr. F. W. Anderson, col- 

 lected at Sand Coulee, July 24, 1888. It is conspicuous, 

 fairly covering some of the leaves, as on Ranunculus Cym- 

 balaria. (7) My 1888 list calls for this fungus on Amclan- 

 chier alnifolia Nutt., but the paper has been lost. Some ol 

 my correspondents will have it, marked T S S () . (8) This year 

 this fungus has been remarkably abundant on Astragalus 

 Canadensis L. It came early, even in August, and is still 

 developing the last of September. Both sides of the leaflets 

 are as black with perithecia as if painted. (9) Ranunculus 

 scelcratus L. But a very small amount of this has been ob- 

 tained. 



Erysiphe sepalta E. & E. n. sp. This species is so named 



only provisionally, and may yet prove to be only an old spe- 

 cies under peculiar circumstances. It grows on the leaves 

 and stems of Btgelovia gravcolcns var. alhicauHs Gray- 

 Found in September and October and even in November. 

 at Helena. It comes so near to E. cichoracearum that it 

 may well be doubted if it be a new species ; but the perithe- 

 cia appear embedded in the woolly coat of the host. If after 

 further study this can be proved to be a constant distinction, 

 Ellis and Everhart will publish it as one of my new species. 

 Erysiphe cichoracearum DC. (1) On Solidago sero- 

 tina Ait. Abundant in September. Perithecia deeply col- 

 ored brown and very abundant, with a most decided prefer- 

 ence for the upper surface of the leaves. Most of my hosts 

 are clean on the underside, revealing under the glass a peri- 

 thecium here and there, but usually not to be seen with the 

 unaided eye. (2) On Aster Icevis L., September, 1888. 

 Much like that on Solidago serotina. Not seen in 1889. (3) 

 On Bigcloma Doug las tt Gray. This host grows abundantly 

 around Helena, yet I have never seen the fungus on any ot 

 our B. Douglasii. Mr. F. W. Anderson obtained my speci- 

 men in October 1888, on the McCarthy Mountains, near 

 Willis. This specimen shows mycelium scarce, with com- 

 paratively abundant perithecia. Mr. Anderson marked the 

 identification with an interrogation. Examination reveals the 

 asci suspiciously elongated in comparison with the width; 

 otherwise it is as E. cichoracearum. (4) On Aster /oh >aceus 

 var. Eatoni Gray. Collected by Mr. F. W. Anderson on 



