GAMETOPHYTE AND SPOROPHYTE. 



235 



ing from the endosperm into the embryo is stored in the cotyle- 

 dons for use during germination. In other plants the endosperm 



Fig. 309. Fig. 310. 



Section of one end of ovule of trillium, showing Embryo e n - 



young embryo in endosperm. larged. 



is not all consumed by the time the seed is mature. Examples of 

 this kind are found in the buttercup family, the violet, lily, palm, 



Fig. 311- 

 Seed of violet, external view, and 

 section. The section shows the embryo 

 lying in the endosperm. 



Fig. 312- 

 Section of fruit of pepper (Piper 

 nigrum), showing small embryo lying 

 in a small quantity of whitish endo- 

 sperm at one end, the perisperm oc- 

 cupying the larger part of the interior, 

 surrounded by pericarp. 



jack-in-the-pulpit, etc. Here the remaining endosperm in the 

 seed is used as food by the embryo during germination. 



463. Sporophyte is prominent and highly developed. — In the angiosperms 

 then, as we have seen from the plants already studied, the trillium, dentaria, 



