256 Ward. — On Relations between Host and Parasite 
yellow-grey. The shape of the ‘ seed ’ makes it lie on the 
side, and not as in so many on the flattened back. 
My samples germinated slowly, and not very well. Of 
twenty-two ‘ seeds 5 sown, only eleven had put forth root-hairs 
in five days, though on the sixth day twenty were showing 
signs of germination : of these, however, only five had put 
out a spear. 
In addition to these I have examined, less thoroughly as 
yet, the following. 
B. giganteus is of the B. sterilis or B. madritensis type but 
with the five nerves of the palea well marked. It is 12-13 mm. 
long, excluding the two fine papery teeth 2-3 mm. and awn 
14-15 mm. and about 1 mm. broad. Duller grey-yellow than 
any of the above. B. giganteus, L., is a native of Europe and 
Siberia. It is frequently regarded as — or, possibly, con- 
founded with — a Fescue — Festuca gigantea (Vill.). 
It is being cultivated for further examination. 
* B. pratensisl 
Is a form very like a depauperate variety of B. arvensis , 
6-6*5 x 1*75-2 mm. with a fine awn about 4 mm. long, but 
flatter, broader, and of paler colour, and with no purple hue in 
the mass. It is much smaller than B. racemosus and quite 
different from B. erectus ) but as there was another form mixed 
with it, I defer judgement until later. 
B. pratensis according to the Index Kewensis is a synonym 
for B. racemosus or B. erectus , both of which differ in my 
samples from the c seeds ’ received under this name. 
i B. ciliarisl Torr. 
Was received under this name, but as yet I have been 
unable to trace it satisfactorily, and am cultivating it for further 
determination 1 . 
B. ciliaris , Torr., resembles B. tectorum , 10 x 1 mm., awn 
1 It seems probable that this is wrongly named, and was sent over by a 
collector who made some error : I have been unable to trace the name in the 
literature (see p. 246). 
