in the Bromes and their Brown Rust. 251 
to the London Catalogue. Like so many other Bromes, and 
perhaps more than most, it has been extensively introduced 
as a weed of cultivation into the Colonies and elsewhere 
abroad: e. g., Canada, Australia, the United States, India, & c. 
B. inter ruptus, Hack. 
Approaches B. mollis and B. racemosus in many characters, 
measuring 9x2 mm. and awn 9-10 mm. It is slightly downy. 
In the mass the colour, & c., are the same. It differs in the 
marked tendency of the florets to remain in the spikelet. Its 
chief characteristic, however, is the split inner palea, which 
is cut to the base in the median line. 
B. interruptus seemed sharply distinct by the non-separa- 
tion of the ‘ seeds ’ in the spikelet, and consequently germinates 
in tufts of about 5~7* It was not up in a week, but quickly 
rose about the eighth or ninth day. In other respects it 
resembles B. arvensis , B. mollis , and B. racemosus . In the 
intermediate pit the spears were 1 cm. high in five days. 
The third leaf is 10-12 cm. by 2 mm. and resembles the 
species named. 
The four-day seedlings are also exactly like parallel cultures 
of B. mollis , except that the spikelets do not so readily break 
up, and the germination is slower. The plumule is green and 
not bronzed. 
B. interruptus , Hack., is regarded by the editors of the 
London Catalogue, 9th ed., 1895, as a variety of B. mollis , L., 
a view supported by my examination of the seedlings. It 
was discovered by Druce in 1895 1 in England, and is 
sharply marked by the deeply split inner palea. 
B. racemosus , L. 
Has a larger ‘seed’ than B. mollis — e. g., 10x2-2*5 mm. 
with awn 9-10 mm. — though otherwise they are similar in 
shape (the palea lying open) and colour. Perhaps the ciliation 
and nervation are less evident in B. racemosus. In the mass 
