Pole Evans . — The Cereal Rush. 
459 
before they show any signs of branching. This is naturally what we would 
expect, for the pustules are always few, and scattered at great distances on 
the leaf. 
Nuclei. 
The nuclei closely resemble those of P. Symphyti-Bromorum. They 
are oval in shape, and nearly always seen in pairs, lying just one behind 
the other in the thin hyphae. They divide very rapidly by the direct 
method. A large nucleus becomes drawn out into a long oval-shaped 
body and is then gradually constricted at the middle, the two halves finally 
separate, regain their normal size and shape, and remain for some time 
in close proximity to one another. 
Haustoria. 
The fully-developed haustoria all appear to be of the shape shown 
in Fig. 44, but frequently this form is seen coiled on itself, as is 
shown by Marshall Ward ( 33 ) for P. Symphyti-Bromorum . Here, again, 
the hammer-headed form so common in P. Symphyti-Bromorum is very 
rarely seen. 
Puccinia coronifera , Kleb. 
This is the ‘ crowned rust ’ of the Oats ; for some time it was in- 
cluded under the Crown Rust proper, P. coronata , Corda, but for reasons 
given below it must now be regarded as a distinct species. 
Nielsen ( 28 ) first showed that the aecidiospores from Rhamnus 
cathartic a when placed on Lolium perenne produced the uredospores, and 
eventually teleutospores, whereas aecidiospores from Rhamnus Frangnla 
failed to infect Lolium perenne. 
Plowright ( 30 ) found that the teleutospores from Dactylis glomerata 
and Festuca silvatica readily produced the aecidium on R. Frangula , and 
so he says that he thinks two species are confounded under the name 
P. coronata. He also adds the following interesting and important fact, 
which I also have noted during the past two years, viz. the fungus which 
occurs on Lolium perenne is accompanied by a profuse development of 
uredospores, but only in the autumn, from September to November, after 
which the teleutospores follow ; whereas the fungus on Dactylis is an early 
summer species with a much less free development of uredospores. 
Klebahn (20) in 1893 showed that the teleutospores from Lolium perenne 
when sown on Rhamnus cathartica readily produced the spermogonia and 
aecidia, whereas similar sowings on R. Frangiila failed. 
On this account Klebahn (20) in 1892 insisted on the splitting up 
of the old P. coronata , Corda, into two species. 
I. P. coronata , Corda. With its aecidium on Rhamnus Frangula 
(Aecidium Frangulae, Schum.), uredo- and teleutospores on Dactylis 
glomerata , Festuca silvatica , and other grasses. 
L 1 2 , 
