240 Ward. — On Relations between Host and Parasite 
scattered on the inside of the glumes and paleae. The colour 
is citron-yellow or pale-cadmium* The spores are globoid, 
or shortly ellipsoid, echinulate and yellow, measuring 25-30/a 
in diameter* 
Puccinia dispersa , Er. The Brown Rust of cereals. 
The spots or sori of uredospores are 1-1*5 mm - long by 
hardly 1 mm. broad, and are scattered without definite order 
over the whole leaf-surface, instead of forming defined confluent 
soral flecks. The colour is brown, i. e. brown-ochre or sienna. 
The uredospores are globoid or shortly ellipsoid, and echinu- 
late. Yellow and from 19-29 /a diameter. 
Puccinia coronata, Corda. The Crown Rust of cereals. 
The uredo-spots or sori are sometimes long, up to 9 mm. 
or so, and somewhat confluent, but they may be only 0*3- 
o-2 mm. diameter. On the lamina they occur mostly above, 
rarely on the sheath, haulms, glumes, or paleae, and are red- 
yellow in colour. The uredospores are globoid or shortly 
ellipsoid, and echinulate, of a bright yellow hue, and measure 
20-32 /a diameter or 28-32 x 20-24 /a. 
In 1900, Eriksson 1 passed on to a further subdivision of the 
Brown Rust of the cereals {Puccinia dispersa). Having found 
that the forms on Secale , on Triticum , on Bromus , and on 
Agropyrum are mutually exclusive as to their host-genera, 
he proposes to regard each as a species, under the names 
Puccinia dispersa (on Secale ), P. triticina , P. bromina , and 
P . agropyrina. To these he adds P. holcina and P. Triseti. 
We are here concerned only with the form named by him 
P. bromina , the Uredo of which may be described as follows 2 : 
sori 1 -10 mm. long x 1 mm. broad, ferruginous, throughout 
the lamina, at first above, aggregated. At length occupying 
the sheath and even the inflorescence. Spores globose- 
ellipsoid, echinulate, 20*8-24 /tx diameter. Easily germinating. 
1 Nouvelles etudes sur la rouille brune des c^reales. Ann. des Sc. Nat., 7® s6r., 
T. ix, p. 241. Eriksson here accepts thirteen species in all. 
2 The aecidium form has since been discovered, according to Miiller, Beitr. z. 
Bot. Cent., Bd. x, 1901, p. 182, and is found on Pulmonaria and Symphytum , not 
on Anchusa. 
