1889. J BOTANICAL GAZETTE. 1 67 



May 6. The two first Amelanchiers much swollen and distorted, 

 secidia already beginning to appear. 



May 12. JEcidia of R> stelia lacerata ("lacerata x") developed luxuri- 

 antly on all the Amelanchiers. No result with Crataegus. 



" G. CONICUM." 



April 28. Sporidia sown on 



2 Crataegus coceinea. 

 May 4. Sporidia sown on 



2 Pyrus Malus. 



2 Crattrgus coceinea. 



1 Amelanchier Canadensis. 



2 Sorbus. 



May 8. Leaves of one P. Malus much discolored, but no spermogonia 

 developed. Sporidia sown on 



1 Amelanchier Canadensis. 



May 12. Leaves and stems of both Amelanchiers much distorted. 



May 14. Spermogonia on both Amelanahiers. No results with the 

 other plants. 



May 24. ^Ecidia began to show on the Amelanchiers, which devel- 

 oped into a Roestelia identical with that obtained from the same Gymnos- 



porangium in 1886. 



G. globosum. 



During the second week in May (the exact date not recorded) spo- 

 ridia were sown on large potted plants as follows : 



2 Cydonia vulgaris. 



2 Pyrus Americana. 



3 Crataegus coceinea. 



2 (small) Pyrus Malus. t 



Spermogonia appeared abundantly on all these hosts in ten days, es- 

 pecially on the Crataegus. The plants were watched in the house until 

 June 7, when they were set out in the yard of the house in Boston where 

 the culture was made, and left during the summer. On 

 early in September "lacerata y" was found developed abundantly on the 

 Crataegus, and " lacerata z " on two leaves of apples, the leaves having fallen 

 from both the Cydonia and Sorbus. 



CULTURES OF 188a 



G. GLOBOSUM. 



March 17. Sporidia sown on 



1 Pyrus Malus, 



3 ( atcTf/us, 

 all having been forced in the greenhouse at the botanic garden in Cam- 

 bridge. 



exam 



