30 
a complete ring, inclosing the upper part of the first leaf. The opening 
in the plumule-sheath on the side opposite to the scutellum now appears 
for a short distance as shown at G. At H, I, and J it is again closed, : 
and within is seen the arrangement of the leaves of the plumule, K i 
shows the first appearance of the epiblast, while at M it has increased - 
in size. Within the plumule-sheath and first leaf one sees the axis 
with its bundles which belong to the remainin g leaves of the plumule, 
Immediately below the plumule are three secondary radicles repre- 
sented in N and O. The embryo for a considerable distance presentsa 
form similar to that shown at P. The vascular system in the region 
of the secondary radicles presents a confused mass, but here it consists 
of two regular strands which course the lengthened node. As they 
approach the insertion of the scutellum the inner one becomes larger 
until it unites with the bundle of the scutellum. R shows the attach- T 
ment of the epiblast to the axis, the division being marked by a dotted 
line, while T is a section through the main radicle surrounded by its 
coleorhiza. NE 
Homalocenchrus oryzoides (fig. 28, Pl. IV).—The fruits of Homalocen- ; 
chrus, although much smaller and of a different form from that of 
Zizania, yet in the main possess the same structural characters of the : 
embryo. 
Lygeum spartum (figs. 25, 26 A-E, Pl. IV). The embryo of Lygeum — 
differs from the other genera of the Oryzew examined in having a very 
small epiblast. The insertion of the scutellum-bundle occurs directly D 
beneath the plumule, Also at this point branches are sent off into the — 
plumule-sheath (fig. 26 B). The radicle is here lengthened out to a : 
considerable extent. Lateral roots also arise from the node, as in fig. 
€ secondary radicles and the base of the epiblast. 
—Compared with the amount of endo- 
ll embryo. The epiblast is large and . 
n Lygeum, the insertion of the scutellum is at es 
le. The large radicle is directed obliquely 
Tribe PHALARIDE Æ. 
Of the Phalaridew only Phalaris and Anthoxanthum (fig. 29, Pl. IV) 
were examined. These much resemble the Agrostidew, having a small i 
epiblast and a straight radicle. The scutellum-bundle is inserted at 
the base of the plumule-sheath, 
Tribe AGROSTIDE X. 
The Agrostidea may be characterized as fruits with small embryos, x ] 
always with an epiblast, which, however, varies greatly in size. The - 
scutellum-bund]e is inserted on the axis at the base of the plumule. 
running up into the plumule- 
