REED: SPECIALIZATION OF PARASITIC FUNGI 359 
Stakman’s (143) results with the cereal rusts, in general, confirm 
those of Freeman and Johnson. He found that uredospores from 
barley infected rye, barley and wheat, but not oats; uredospores from 
oats infected wheat, rye and oats, but not barley; .uredospores from 
rye infected rye, but not wheat nor barley; uredospores from wheat 
infected barley, rye and wheat, but not oats. Uredospores from 
Agropyron repens gave the following results: on wheat, on oats, on 
barley and on rye. 
Stakman (144) briefly mentions some other results with this rust. 
He states that uredospores from Agropyron repens, A. tenerum, A. 
caninum, A. smithii and Hordeum jubatum readily infect barley and 
rye, very slightly wheat and practically fail to infect oats. Uredo- 
spores from Dactylis glomerata and Poa nemoralis infect oats, but not 
the other cereals. Practically no success was attained in trying to 
infect any of the cereals with uredospores from Agrostis alba, A. 
stolonifera, Anthoxanthum odoratum, Calamagrostis canadensis, Poa 
pratensis and P. compressa. 
Bolley and Pritchard (20) state that uredospores from barley 
(Hordeum jubatum) and Avena fatua were able to infect wheat and 
uredospores from wheat produced infection on barley and Hordeum 
jubatum. 
Pritchard (110), in North Dakota, suggests that distinct races 
occur on wheat and barley, although he gives no experimental evi- 
dence. Another race occurs on rye, oats, Avena fatua, Agropyron 
repens, A. tenerum and Hordeum jubatum, as indicated by inoculations 
with uredospores from the gramineous hosts and aecidiospores from 
the barberry. 
Gassner (58) has reported brief results on this rust in South America. 
He was able to infect wheat with uredospores taken from barley, oats, 
rye, Lolium temulentum and Dactylis glomerata. Barley was also 
infected by uredospores from wheat. 
As noted before, the infecting capacity of aecidiospores from bar- 
berry has been tested, as well as that of the uredospores from various 
gramineous hosts. Eriksson (41) has infected the barberry with 
teleutospores from more than fifty different grasses. In some cases 
the aecidiospores thus experimentally produced were used to inoculate 
various grasses. In general, the aecidiospores from the barberry are 
restricted in their ability to infect grasses in the same way as uredo- 
spores from the grasses which were used as a source for the teleuto- 
spores for inoculating the barberry. It should be noted, however, 
that aecidiospores from the barberry, produced by inoculation with 
teleutospores from Bromus madritensis, Briza maxima, Festuca myurus 
and Phalaris canariensis, recorded as hosts for the specialized race 
