134 . THE SEED, 
this point the vessels which convey nourishment enter the 
seed. These vessels, clustered together, form the funiculus, 
and they derive their origin from the placenta. The funi- 
culus is well seen in the pod of the Pea (Fig. 47. par 492.) 
In the seed the foramen is termed micropyle, and the radicle 
of the seed always points towards it. 
517. When the placenta expands around the seed, it forms 
acovering called arillus, asthe Nutmeg (Myristica Moschata), 
the mace of which is the arillus. The Spindle-tree (Euony- = 
mus), has an orange-coloured arillus enveloping the seed. 
M. Richard observes, that the arillus never occurs in plants i 
with a monopetalous corolla. : 
518. The integuments, taken together, constitute what Is 
called the episperm, and they are frequently incorporated toge- : 
ther, so that there appears to be only one covering. The 
Fig. 55. _ primine of the ovule becomes the spermoderm, 
~~ or testa of Gaertner. The secundine receives 
the name of mesosperm; and the others are 
called endopleura. The epigperm is very dis- 
tinct in the Pea and Bean; and the hilum 
— ___ always placed on it. (See Fig. 55, in which 
the dark part is the hilum.) 
_ 519. The albumen is the peculiar mucilaginous or amyla~ 
ceous substance found in many seeds between the integu- 
ments and the embryo. It has also received the names of 
_ perisperm and endosperm. 
_ 520. The annexed table will better illustrate the structure 
_ and names of the corresponding parts in the ovule and seed- 
~ Ovens. SrEeEp. 
ine corresponds to _Vitellus 
JA 
Albumen 
Sreea ret Mesosperm 
-Endopleura 
Episperm. | 
