26 if. ÖS—!»: (K ^; ?rt o »f ?£ 



X. Summary. 



1. riie n.ix nist i-s now widcl)' (listiil^utctl tliroughout the flax regions of 

 our country. 



2. riic c<iiis,il funi^us, MLlaiiifisora linipcrila (Kökn.) Pai.m belongs to an 

 aiitoccious H//-ii!ii(!ii!pSi>rii as well (lemi>nstratc(] by J. C. Au'i'riuR. 



3. This fungus affects not onl)' the steins and leaves of the host plant, 

 but also tiie [jods and bracts. 



4. Its sperm. itia are produced <in sc[)tate branching s|)crmatio[)hores as 

 well described by V. D. Fkom.mic. 



5. Its accidiinn is a typical Cai'oina-\.y\)c. 



6. The ijarencliyniatous [teridiuni covering its urcdosorus was observed as 

 first demonstrated by Ed. I'"ischek. 



7. Teleutospores reqm're a rest period and germinate at early spring. 



8. Six to ten da\s are acquired for the formation of the spermogonia and 

 10 to 17 tla\-s for that of the accidia. 



Q The incubation period of the urcdo.spores from the time of inoculation 

 of either aecidiospores or urcdospores to the appearance of new uredosori, varied 

 within a limit of 7 to 12 da\'s, the average period being 9 days. 



10. Ottawa 770 U and W'illiston Golden and three strains of Argentine 

 race [Argentine (Hexrv), Argentine Sei. and Cayagneo] are immune or very 

 resistant to the rust. 



11. The so called "Argentine" from the Hokkaido Agricultural Experi- 

 ment Station and the Teikoku Seima Kaisha is susceptible to the disease. 



In the B<jtanical Inslitute, Faculty of Agriculture, 

 Hokkaido Imperial University, 



Sapporo, Japan. 



