J02 NATURAL HISTORY BULLETIN. 



B. Dennis: the P. niaritiuia at Dartmouth. Mass.. by Dr. W. 

 G. Farlow. P. nigra sent me by Prof. L. H. Bailev was 

 collected at Alma, Mich., and the De Soto plum from Utica, 

 Wis., was sent me by Prof. Wm. Trelease.. Prof. Harkness 

 sent me the specimens upon P. snb-cordata. He reports that 

 owing to the prevalence of the disease, the California Wild 

 Plum is seldom tit to eat. 



I have had no opportunity to study the species upon P. 

 pitinihi. 



ExoAscus FARLOWii \ Scidchcch \ Saccardo. Plate I. Fig. 3. 

 Bibl. and S\n. : 

 Exoascus -pruiii Auct. Amer. pp. 



Ellis "79. Farlow 'S3. 



Tap/in')Hr pni)!/' \\\ci. Amer. pp. 



Robinson '87. 



Tiip/in'iia farlozvii Sadebeck '90. 

 E.xocji^nts /ar/oicii ( Sadeb.) Sacc. '92. 

 E.xoasnts farhnvii Sadebeck "93. 



The ovaries of PriDiiis scrofiiia are deformed by this spe- 

 cies much in the same manner as those of the hosts of E. 

 priiiii and E. comjiiiiiiis. There is a hypertrophic affection of 

 the entire carpels: the fruits become elongated and pointed; 

 the lioral envelopes are persistent. 



Sadebeck "90 first described the species as with -asci com- 

 paratively far apart.*' size, 8-9// x 15-25//. I have examined 

 material collected at Cambridge. Mass., by Dr. W. G. Far- 

 low: at London, Canada, bv J. Dearness. and sent me from 

 Iowa bv Prof. T. H. ]Mcl^ride. My results do not in any 

 instance entirely correspond with Sadebeck's description.^ I 

 tind the asci measurements to be 10-11x25-32// w'ith stalk- 

 cells 8-ioxii-i6,« and also the asci almost without exception 

 are closely crowded together. The latter can be no very con- 

 stant feature nor important ground for specific determination, 



'Sadebeck, R. D'lr pardnUiclicii Emhisccoi, etc., p. 47. 



