I08 NATURAL HISTORY BULLETIN. 



cells are 6 8// .high and ma}/ be 6~gn thick; they are more or 

 less pointed at the base and may sometimes extend slightly 

 between the epidermal cells. A typical ascus is octosporic, 

 but there are two departures from this state; in one, by divis- 

 ion they become much more numerous; in the other a fewer 

 number develop, sometimes not more than four; in this case 

 the spores may be quite large; their usual size is 3-4," in 

 diameter. An appearance of the disease may be expected 

 wherever the peach-tree is cultivated. Methods of preven- 

 tion and treatment are topics of great importance and subjects 

 of experimentation at the various agricultural stations. I 

 have examined the species upon Primus -persica from locali- 

 ties too numerous for enumeration. My specimens of Primus 

 chicasa were collected in Alabama by Prof. G. F. Atkinson; 

 in California by Prof. H. W. Harkness, and sent me from 

 h3wa by Profs. T. II. McBride and L. H. Pammel. 



ExoAScus BACTERicsPERMUS ( yo/id iisoii ) Sddchcck. Plate IL 

 Fig. 3. 



Bibl. and Syn. : 

 Taphrina barter iospcnuns Johanson. 



Rostrup 'S8. 

 '91. 



Exoasciis bactcriospcnuns ( Johans. ) Sadebeck '93. 



This species has been reported as occurring in Greenland 

 upon Bcliihi nana only. I have found what well agrees with 

 the original description of Johanson '87 upon leaves of Bctula 

 ii-landulosn, collected at Lake of Clouds, Mt. Washington, by 

 Mr. Kingo Myiabe. 



Lar<je areas are affected, becoming dark reddish brown, 

 and causing a curling of the leaf. The asci, densely packed^ 

 are generally upon the lower side of the leaves, but some- 

 times upon the upper; they are rather smaller than the meas- 

 urements of Johanson, being 14-16x37-46//; the apices are 

 rounded or truncated, as also are the basal portions, which are 

 frequently dilated to 18-32//. The spores are globose 3.5- 

 4.5/, but asci soon till with minute conidia. 



