78 a Q *7 Mycologia 



231 



cies and with this particular race from morphological and field 

 studies. 30 



ii. Gymnosporangium Nelsoni Arth. (G. durum Kern). 

 Galls of this rust a half inch in diameter from Juniperus scopu- 

 lorum, gathered by Mr. Bethel at Cimarron, Colo., were used for 

 sowing- May 25 on Amelanchier canadensis and Crataegus punc- 

 tatus. Infection occurred only on Amelanchier, showing abundant 

 pycnia June 4, but giving only a few aecia, first noticed July 17. 31 



12. Gymnosporangium Betheli Kern. A collection of galls 

 on small branches of Juniperus scopulorum, made by Mr. Bethel 

 at Plainview, Colo., were used to sow, June 4, on Crataegus 

 Pringlei, giving rise to pycnia June 14, and aecia July 17. 32 



13. Gymnosporangium gracilens (Peck) Kern & Bethel. A 

 collection on Juniperus utahensis, made by Mr. Bethel at Glen- 

 wood Springs, Colo., was used for sowing on Philadelphia coro- 

 narius, giving an abundance of pycnia May 31, and aecia June 14. 

 Another sowing was made at the same time on a horticultural 

 form closely related to P. coronarius, imported from France, P. 

 Kcteleerii ) which resulted in a luxuriant growth of pycnia May 

 30, and aecia June 22. These results confirm previous work. 33 



Cultures of 19 13 



14. Puccinia albiperidia Arth. A collection made by Mr. 

 L. S. Orton at Walden, Vt, on a narrow-leaved Carex, and com- 

 municated by Mr. C. R. Orton, was used to sow, May 29, on 

 Ribes Cynosbati, giving abundant infection with pycnia showing 

 June 6, and aecia June 20. The rust was labelled by Mr. Orton 

 P. uniporula, and our examination confirms this view, many ure- 

 diniospores having been seen with one basal pore and none with 

 equatorial pores. This does not, however, preclude the possibility 

 of the infection coming from the three-pored form, which may be 

 intermixed with the other, and the species is listed accordingly 



30 See North American Flora 7: 231. 1912. For previous cultures see 

 Mycol. 4: 29. 1912; also Fraser in Mycol. 4: 186. 1912. 



31 For previous cultures see Mycol. 4: 61. 1912. 



32 For previous cultures see Jour. Myc. 14: 23. 1908; Mycol. 1: 240. 

 1909; 2: 230. 1910; 4: 25. 1912. 



33 For previous cultures see Mycol. 4: 63. 1912. 



