RELATIONSHIP AND PTIYSTOLOGTCAL. SPECIALIZATION. 9 



Table J.— Results of experiments in inoculating various.grasses with uredospores of rust. 



The rust rather easil3^ transferred to Avena sativa (17 out of 30 

 inoculations), Secale cereale (8 out of 41 inoculations), Festuca 

 elatior^ (6 out of 66 inoculations), Dactylis glomerata. (22 out of 122 

 inoculations), ArrJienatlierum elatius (8 out of 47 inoculations), and 

 Poa compressa (13 out of 47 inoculations). Inoculations on other 

 grasses produced no infection. Similar results were obtained by 

 Eriksson ^ in inoculation experiments with this, rust on Avena sativa. 

 Secale cereale, and Festuca elatior} No inoculations on Dactylis 

 glomerata, Arrhenatherum elatius, or Poa comjiressa are cited in his 

 re})ort. Direct inoculation on Triticum vulgare and Hordeum vulgare 

 gave negative results in 10 trials each, thus corresponding to the 

 negative results in numerous similar trials of Eriksson.^ From these 



' The tall meadow fescue was used in our work. It is probable that the same variety was used by Eriks- 

 son, as this is the common form known by that name in Sweden. 



* Eriksson, Jakob. 1st der Timotheengrasrost eine selbstandige Restart Oder nicht? Ofversigt af Ken 

 gliga Svenska Vetenskaps-Akademlens Forhandlingar, no. 5, 1902, pp. 193-196. 



92430°— Bui. 224—11 2 



