NOTES ON UREDINOPSIS MIRABILIS AND 
OTHER RUSTS 
W. P. Fraser 
A few culture experiments were carried on during the season 
of 1913, and, though nothing new was established by these cul- 
tures, yet, since some of them confirm important results that 
rest only on the previous experiments and observations of the 
writer, a brief record may be of interest. 
Little culture material could be found in the vicinity of Mac- 
donald College, so that the writer was dependent on the generosity 
of the following who contributed material for the experiments : 
Professors R. Matheson and H. W. Smith, of the Nova Scotia 
Agricultural College, Truro; Mr. Robert Inglis, Pictou, N. S.; 
Miss Muriel Macrae, Durham, N. S. ; and Mr. W. H. Brittain, 
Plant Pathologist of British Columbia. To these, the writer 
wishes to express his sincere thanks. 
Uredinopsis mirabxlis (Peck) Magn. 
Teliosporic material of this rust collected at Truro, N. S., was 
placed in a moist chamber until the teliospores were germinating 
freely. It was then suspended above a young plant of Abies 
balsamca (L.) Mill, on May 15th. Pycnia were present on the 
leaves on May 23d and aecia in abundance on June 1st. Another 
sowing on May 15th gave pycnia on May 25th followed by 
abundant aecia. A third sowing on May 16th was followed by 
pycnia on May 27th and aecia by June 3d, both in abundance. 
Two other sowings were made later with success, but the in- 
fection was not so marked, probably owing to the shoots being 
more mature. Six plants of Abies balsamea obtained at the same 
time and place were kept as checks and remained free from 
infection. 
The species of the genus Uredinopsis are not separated by any 
marked morphological differences, also a number of them have 
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