329 



this species have been conducted every year since the spring of 1886 

 . . . and the results in all the cultures were identical." 



Arthur in 1907 (Jour. Myc. 14:19. 1908), using sporidia from 

 J. virginiana collected in Illinois, obtained successful infection of Malus 

 Malus with production of pycnia followed by aecia, but failed to obtain 

 infection of Amelanchier intermedia. In 1909 (Mycol. 2:230. 1910) 

 successful infection of Crataegus Pringlei with production of pycnia 

 only, and of Malus loivensis with development of aecia was obtained, but 

 without infection on Amelanchier canadensis. In 1910 (Mycol. 4:25. 

 1912) infection of Cydonia vulgaris and Amelanchier vulgaris with pro- 

 duction of pycnia only is recorded. In 1911 (Mycol. 4:56. 1912) using 

 sporidia from New .Jersey successful infection of A melanchier erecta 

 resulted in the production of aecia on fruits; using sporidia from Ne- 

 braska successful infection of Mains coronaria with production of pycnia 

 only is recorded. In 1914 (Mycol. 7:83. 1915) Amelanchier vulgaris 

 was inoculated with telial material from Massachusetts and abundant 

 production of pycnia and aecia resulted. 



27. Gymnosporangium transformans (Ellis) Kern, Bull. N. Y. Bot. 

 Gard. 7:463. 1911. 



Roestelia transformans Ellis; Peck, Bull. Torrey Club .5:3. 1874. 



Gymnosporangium fraternum Kern, Bull. N. Y. Bot. Gard. 7:439. 

 1911. 



On Malaceae: I. 



Aronia arbutifolia (L. f.) Ell., Seaford, June 1908 (2262). 



The above collection is of pycnia only. 



Dodge (Torreya 15:13.3-134. 1915; Bull. Torrey Club 42:519-542. 

 1915) has studied the foliicolous form occurring on CJiaitiaecyparis 

 thyoides which until Kern's monographic study (1. c.) had been con- 

 sidered a form of G. bisejitatum. His work clearly shows that this leaf 

 form has for its aecia Roestelia transfo/vians on Aronia having repeat- 

 edly obtained infection followed by development of aecia on A. arbuti- 

 folia and A. nigra. He also claims to have obtained infection with the 

 leaf form on Amelanchier intermedia, A. canadensis and A. Amelanchier, 

 re.sulting in the development of aecia having the morphology of R. Bot- 

 ryajntes which has been repeatedly shown to go to the branch form 

 known commonly as G. bisejitatum. The young infections of G. bisep- 



