154 ANDERSON: EMBRYOGENY OF MARTYNIA LOUISIANA 
same time, the enlarged embryonal cell divides longitudinally 
forming a two-celled embryo (Fics. 38 and 35). The second 
division of the embryo is usually transverse and the third longi- 
tudinal, thus forming the octant stage The further growth of 
the embryo is illustrated in Fics. 39-43 and is so like the well 
known development of Capsella that details are unnecessary. 
The very long suspensor, shown in Fig. 35 in dotted 
lines, is almost indentical with that of Trapella sinensis Oliv. as — 
figured by Oliver (5, pl. 7, f. 36). The suspensor of Myoporum 
ii 
2 
Cy 
¢, 
we 
ang Oe, 
‘ 
‘ 
, 
t 
' 
' 
4 
4 
1 
‘ 
1 
1 
‘ 
Fics. 37-43. Development of the embryo. Fics. 37-38, X 500; FIGs. 
39-42, X 175; Fic. 43, X 6. E, embryo; U, suspensor; C, cotyledon; R, 
radicle; K, chalazal end of embryo-sac; Q, micropylar end of embryo-sac; 
N, remains of antipodals; V, soft, inner portion of seed coat; W, hard, warty 
portion of seed coat. 
serratum as figured by Billings (1, f. sz) is also similar in struct- 
ure but does not push the embryo as far down into the embryo-sac 
as that of Martynia, although the shape of the embryo-sac and 
the development of the endosperm are much the same in both 
species. Usually a second and sometimes a third division 
occurs in the suspensor, resulting in two or three short cells 
next the embryo, the innermost of which seems to contribute to 
its formation. 
Fic. 43 shows a section of a young seed containing a nearly 
mature embryo. The radicle (R) is short and thick while the 
