r ^9-] BOTANICAL GAZETTE. 1 65 



for the true R. lacerata as above distinguished ; " lacerata y" 

 for the form common on Crataegus, usually known in this 

 country as the typical R. lacerata, and distributed in Ellis' 



-\ . A. F. No. lO.S^ UflHer thia n:imo tha onarMmana I.. 1 ,,. .11.^1 



N 



„. vw & uo w^^uica ucmg me must typical ; wnne 



••lacerata #" was used to designate a small form apparently 

 not distributed, but very common (in New England, at least) 

 upon leaves of Pyrus Mains, especially on wild stock. These 

 two forms ("lacerata/' and "*'M I shall haveoccasion to refer 

 to presently in connection with G. globosum. It is, therefore, 

 sufficient to say that I then suggested their identity with 



Rcesteli a corxuta. — To this species I was constrained, 

 I think erroneously, to refer the iridium which followed 

 the infection of Amelanchier with what I then considered 

 the^ American form of G. conicum, namely, the common 

 "birds'-nest " Gy mnosporangium figured in Farlow's fc * Gym- 

 nosporangia of the U. S M " plate n, fig. 22, under the name 

 G. clavipes, and distributed also as clavipes in Ellis' N. A. 



). 1084 b ( n °t a )- I say constrained, since the Roestelia 

 was referable to no other described species, and it seemed 

 that the^ differences between the culture and our supposed 

 forms ot R. cornuta might have been accidental. 



Rcesteli a botryapites, a form not to be confounded 

 with any other American species followed sowings of G. bisep- 

 tatum on Amelanchier. 



RcESTELlA AURANTIACA which followed sowings of the true 

 G. clavipes on Amelanchier stems is also too well marked to 

 need further comment. It may be mentioned here, however, 

 that although Crataegus, Amelanchier, Pyrus Malus and Cy- 

 donia are the only recorded hosts of this species, it has been 

 observed by Prof. Farlow on the fruit of Pyrus arbutifolia in 

 Massachusetts, and Mr. Mivabe has kindly sent me a specimen 

 collected by him on the same host at Grand Menan Island. 



The experiments with G. Ellisii were not satisfactory, 

 while G. globosum produced nothing beyond its usual luxu- 

 riant and brightly colored spermogonia on Crataegus ; spermo- 

 gonia also appearing on Sorbus and Amelanchier; but in no 

 case producing aecidia., the leaves having withered and fallen 

 oft about two months after their infection. 



The above contains in general the results of my first cul- 

 tures. Turning now to those subsequently made the results 

 were as follows. It should be stated at the outset that, like the 

 first set of cultures, those subsequently made were conducted 



