168 
Lvansactions British Mycological Society. 
and thirteen generations old. The spores showed good germina- 
tion in every case. 
Hosts inoculated 
Agvopyron 
Date Wheat Barley Rye Oats repens 
1g2I 
Aug. 8th R4 2 g Ex. $ ae 
Heavy Moderate 
En} Bos 3 
Very weak Weak 
1922 
Feb. toth R= Boy ¢ 2 
Heavy Moderate 
J + By ts 
Moderate Weak 
ies uk i 
eal 
March 7th 2 B, 5 gets 
Heavy nea 
En +5 
Very weak 
Note. In the above table R, J and En stand for varieties of wheat called 
Red Sudan, Little Joss and Einkorn respectively. Bg) stands for a variety of 
Mesopotamian barley, B, for Archer barley, B,,; for Webb’s winter 6-row 
barley. LE, stands for a strain of Thousand dollar oats. The denominator in 
the fractions indicates the number of seedlings inoculated and the nominator 
the number actually infected. The nature of infection is also indicated. In 
the case of Einkorn wheat the pustules were exceedingly small and appeared 
much later than those on other hosts. 
Seedlings of Lolium perenne, Arrhenatherum avenaceum, 
Dactylis glomerata and Hordeum jubatum were also inoculated 
along with others in the first experiment but none of them 
was infected. 
Eriksson* has stated that in Sweden, barley, rye and oats are 
sometimes weakly infected by the black rust of wheat. The 
results of Stakman and Piemeiself are quite in agreement with 
Eriksson’s except that barley has been found to be a congenial 
host by these writers. As regards the wild grasses referred to 
above, Stakman and Piemeisel have stated that Hordeum jubatum 
is one of the hosts infected in nature by this biologic form and 
that Agropyron repens can be weakly infected by it. The same 
authors have observed that even rye is found infected by it in 
nature. 
Ber. Deutsch. Bot. Gesell. x11, p. 292 (1894); Centralbl. f. 
* Eriksson, J., 
Zeitschr. f. Pflanzenkrankh. Iv, p. 66 
Bakt. Bd. 1x, Abt. 2, p. 590 (1902); 
(1894). 
J Stakman, E. C. and Piemeisel, F. J.. Journ. Agr. Res. x, p. 429 (1917). 
