34 
E shows a section taken at the base of the plumule with the bundles in E 
the axis whieh belong to the leaves of the plumule, also the two bun- 
dles of the disappearing plumule-sheath. At F the scutellum bundles 
are inserted on the axis. On the opposite side are two secondary rad- 
icles in the center of the bundles of the axis, while to the right and left 
appear the origin of the bundles of the plumule-sheath. At C the 
seutellum-bundles are no longer present, while three secondary radieles 
emerge from the axis. Four of the secondary radicles may be seen at 
H with the axis continuing down to form the main radiele. These rad- 
icles are all provided with a root-cap and surrounded by the coleorhiza. 
"Although no epiblast is found here yet there is a slight prominence 
which might indieate its abortion. 
Secale montanum (tigs. 67, 68 A and B, Pl. VII).—The structure of 
the fruit of Secale resembles that of Hordeum vulgare. There is how- 
ever only one secondary radicle. Not even a trace of an epiblast can 
be seen. The coleorhiza surrounds both radicles, forming a deep groove 
between them. At the base of the plumule-sheath next to the seutel- 
lum there is a lateral bud. The seutellum-bundle consists of a single 
strand, which is inserted on the axis almost directly at the base of the 
plumule. At this point branches are sent off into the plumule-sheath. 
The bundles in the axis belong to the leaves of the plumule while the 
axis continues down into the main radicle, a branch being sent off to 
the secondary radicle, Fig. 68 B represents a transverse section 
through the upper part of the plumule and A through the main and 
secondary radicles. 
Elymus virginieus (figs. 72 and 73, Pl. VIII).—The fruit of Elymus 
has a very small embryo at the base of a long fruit. Although the 
epiblast is not present yet there is a slight elevation which might be 
regarded as a remnant of it. The scutellum bundle consists of a single 
strand which curves around to the base of the plumule where it 
divides into three branches, two of them going into the plumule-sheath 
and the other continuing down into the axis and single radicle. A 
lateral bud is present in the axil of the plumule-sheath. Fig. 73 rep- 
resents à transverse section through the upper part of the plumule. 
Lolium rigidum (figs, 70, 71 A-C, Pl. VII). The embryo of Lolium 
resembles Secale montanum with only one large radiele. A lateral bud 
is present in the axil of the plumule-sheath. 
riticum estivum (fig. 69, Pl. VIT).— The fruit of Triticum stivum 
has been so frequently described by previous writers that it is not 
necessary to treat it at length here. An excellent treatise by Bessey is 
to be found in Bull. 32 of the N ebraska Agr. Exp. Station, 1894. Its 
embryo has a small epiblast, a main radicle, and two secondary ones 
situated in front to the right and left. There isa prominent lateral 
bud in the axil of the pl i i 
2 ptumule-sheath. In al ee 
the tribe Hordew, n all other respects it resen 
