200 Journal of Mycology [Vol. 13 



infected both these hosts. Similar material from northern Ger- 

 many infected only Berula. In 1904 aecia were raised in a 

 similar way on Oenanthe aquatica.'^ 



One of the earliest cultures with this pleophagic species was 

 made by Mr. C. B. Plowright with English material, raising aecia 

 on Glaux maritima, which belongs to the Primulas eaer^ 



A careful microscopic study of all these forms shows close 

 agreement in morphological characters, and altogether there 

 appears to be no reason to treat these cultural forms other than 

 biological races of a single species. Scirpus Huviatilis is the 

 American representative of the European S. maritimus, and by 

 many authors is given the latter name. The writer has examined 

 American collections that appear to belong to this species, as 

 follows: on S. fltiviatilis from Iowa, Illinois, Kansas, Nebraska, 

 South Dakota, Ohio, and Wisconsin; on Cicuta maculata from 

 Illinois, Iowa, and Colorado; on Oenanthe calif ornica from 

 central California, Sium cictitae folium from Wisconsin, and on 

 Glaux maritima from Montana and Wyoming. 



18. Gymnosporangium Juniperi-virginianae Schw. — 

 Galls from a tree of Juniperus virginiana near the laboratory, 

 brought in by Mr. F. D. Kern, were used for sowing May i on 

 Malus coronaria, Sorbus americana, and Crataegus Pringlei. 

 Only the first gave infection, which showed abundant pycnia on 

 May 14, but failed to develop aecia on account of injuries.-' 



19. Gymnosporangium GLOiiOSUM Pari. — Galls from a 

 tree of Juniperus virginiana, found in the vicinity of Lafayette, 

 Ind., were brought in by Mr. Guy W. Wilson, and used for mak- 

 ing three sowings on Crataegus Pringlei, and one each on Malus 

 coronaria and Amelanchier sp. All sowings on Crataegus gave 

 abundance of pycnia, and one plant finally produced well formed 

 aecia, the other plants not growing well. No infection was ob- 

 tained on the other two hosts. 



Similar material was also received from Dr. John A. Shel- 

 don, of Morgantown. W. Va.. and sown May 19 on Crataegus 

 Pringlei. Mains coronaria, and Sorbus americana, all giving rise 

 to an abundance of pycnia. As none of the plants grew well, 

 only the sowing on Sorbus formed aecia, these finally reaching 

 maturitv and showing the characteristic structure of the species. 



These results are parallel with, and confirm the work by Dr. 

 Roland Thaxter. done some years ago.-" 



"Ztschr. Pfl.-Kr. 75:74. 1905. 



"Card. Chron. III. 7:682. 1890. 



"For previous cultures see Jour. Mvc. 7^:13. 1906. 



"Proc. Amer. Acad. Sci. ^^:263. 188"7 ; Bot. Gaz. 7^:167. 1889. 



