160 
CHARLES B. PLOWRIGHT. 
that time as being either P. straminis or P. sessilis, but, 
unfortunately, the specimen was not preserved by me. This 
being the case, it is possible that the Puccinia which Oudemans 
and myself have seen on reed may be a third species connected 
with the iEcidium on Rumex acetosa; and as it is of such an 
inconspicuous appearance, may have accidentally crept into Mr. 
Nielsen’s cultures. This, of course, is a mere conjecture upon 
my part, which can only be confirmed by direct observations. 
Lastly, with regard to the belief that P. Magnusiana is 
only a form ofP. graminis occurring upon reed, a duplicated 
experiment was performed in which P. Magnusiana, taken 
from the black lines on the stem, was placed upon Berberis 
vulgaris (362) and Ranunculus repens (358) ; on the 
former it gave no result, on the latter in ten days its iEcidium. 
No. of Infecting Material. Plant Infected. Date of 
Esrpt. 
315. 
Puccinia 
Magnusiana 
Infection. 
Ranunculus re- 24 Apr. 
1st Result. 
10 May. 
335. 
39 
99 
99 
pens 
„ 9 May 
2 June. 
358. 
33 
99 
99 
„ 18 May 
28 May. 
393. 
33 
99 
93 
bulbosus 7 June 
15 July. 
394. 
9 9 
99 
99 
„ 7 June 
15 July. 
395. 
99 
39 
39 
* „ 7 June 
15 July. 
396. 
99 
99 
99 
„ 7 June 
15 July. 
397. 
33 
99 
39 
„ 7 June 
15 July. 
34. 
33 
99 
Rumex conglom- 18 May 
— 
70. 
33 
99 
99 
eratus 
„ 15 June 

81. 
39 
99 
39 
„ 15 June 
— 
167. 
93 
33 
99 
„ 5 June 
— 
72. 
33 
99 
99 
obtusifolius 15 June 
— 
169. 
99 
39 
99 
„ 5 June 
— 
168. 
93 
99 
99 
crispus 5 June 
— 
171. 
93 
99 
99 
kydrola- 7 June 
— 
205. 
99 
99 
99 
patkum 
„ 28 June 
_ 
184. 
99 
99 
Rlieu 
in officinale 12 June 
— 
187. 
99 
99 
99 
„ 13 June 
— 
