326 



23. Gymnosporangium globosum Fail. Anniv. Mem. Boston Soc. Nat. 



Hist. 18. 1880. 

 On Malaceae: I. 



Crataegus phaenopyruni (L. f.) Medic, Newark, Oct. 1888, 

 F. D. Chester. 



Dr. W. G. Farlow (Anniv. Mem. Boston Soc. Nat. Hist. 34:1880 

 and Proc. Am. Acad. N. S. 12:312. 1885) was the first to conduct 

 infection experiments with this species. He succeeded in obtaining 

 pycnia only on Crataegus tovientosa, C. Douglasii, C. oxyacantha, fol- 

 lowing sowings with telial material from J. virginiana. Dr. R. Thaxter 

 (Proc. Am. Acad. Sci. 22:263. 1887; Bot. Gaz. 14:167. 1889) succeeded 

 in obtaining infection resulting in aecia on Crataegus coccinea and 

 Mahis MaluH and spermogonia on Sorbus americana and Cydonia vul- 

 garis. 



In a later report (Conn. Agr. Exp. Sta. Bull. 107:4. 1891) addi- 

 tional work is recorded confirming the previous results on Mains Malus 

 and recording successful infection of Sorb^is americana resulting in the 

 development of aecia. 



Dr. .J. C. Arthur in 1906 (.Jour. Myc. 13:200. 1907) using a telial 

 material from Juniperus virginiana from Indiana obtained aecia on 

 Crataegus Pringlei. Similar material from West Virginia gave aecia 

 on Sorbus ai)iericana and pycnia on C rataegus Pringlei and Malus coro- 

 naria. In 1907, (.Jour. Myc. 14:18. 1908) infection from telial material 

 from Indiana resulting in aecia, was secured on Mah(s Malus. In 1908 

 (Mycol. 1:239. 1909) infection resulting in aecia was obtained on Cra- 

 taegus Pringlei, using telial material from Massachusetts. Pycnia were 

 also obtained on Crataegus sp. using telial material from Kentucky. In 

 1909 (Mycol. 2:229. 1910) successful infection resulting in aecia was 

 obtained on Crataegus coccinea using infecting material from North 

 Carolina. 



24. Gymnosporangium Juniperi-virginianae Schw. Schr. Nat. Ges. 



Leipzig 1:74. 1822. 

 Gymnosporangium macropus Lk. in Willd. Sp. PI. 6": 128. 1825. 

 Aecidium pyratum SchM^ Trans. Am. Phil. Soc. II. 4:309. 1832. 

 Roestelia pyrata Thax. Proc. Am. Acad. 22:269. 1887. 



