842 
Journal 0} Agricultural Research 
Vol. XXVII, No. II 
the gr eat majority of the spores were within 16-23/. by 6-8/t From 2 c 
from w? P °i reS 7 e I e meaSUred from each of the following sources: Rose 
rom natural infection, rose from inoculations with fungus from rose 
Sonf?ith°fiX C s U l ati0n ^ With f £ ngUS fr ° m rose ’ and curran t fr °m inocula¬ 
tions with fungus from horse-chestnut. In all cases the snores acreed 
closely m size with those from currant. The extreme range was^om 
15 25lx by 5 ~ 10 »> but the s P or es fell mostly within the limits 17-22/1 
on currant. The host tissue is indicated bv helvieHhi i b fl ab -?u L J ? enthe c m m which developed 
made with subcultures from the same pyenrapore X 140. B h penthecia resulted from inoculations 
by 6-8/t. The pycnospore measurements were equally satisfactory. In 
iS-oiVh^ ® p ® res measured, the range was 14-31SM by 4-7.5/t, mostly 
agreement 5 ~ 7M ’ the pycnos P ores fro m the various hosts being in close 
Size ° f the stromata was much more variable and is apparently 
directly influenced by the thickness and character , of the bark within 
which they pow. The writers have observed on a single currant bush 
penthecial stromata of this fungus which varied in size from about 1 by 
