128 BOTANICAL GAZETTE [FEBRUARY 
in Striga the chalazal haustorium seems to be slightly longer and 
to have a definite upward curve. 
Embryo 
After fertilization the egg cell does not divide immediately. 
Figs. 19 and 20 show the fertilized egg in the resting stage while 
endosperm is being formed rapidly. 
The first division of the egg is transverse, the lower cell giving 
rise to the embryo, the upper to the suspensor, which develops 
rapidly and is divided into three or four cells by transverse walls - 
(fig. 23). The cell of the suspensor nearest the micropyle increases 
in length far more rapidly than the others and crushes all the endo- 
sperm cells at its apex, thus coming to lie in contact with the 
integument. In appearance the proembryo is rather like that of 
Physostegia (14), and also, though shorter, bears a resemblance to 
that of Myoporum serratum (3). The cross-walls which are present 
in the suspensor of Striga and Physostegia are absent in M yoporum. 
A difference which becomes marked later in the development of the 
_proembryo is the appearance of haustoria in Sériga. These are 
chiefly confined to the basal cell, though in one case the cell below 
has produced a small lateral haustorium (fig. 26). Lioyp (10) in 
his account of the Rubiaceae shows that in many members of that 
family haustoria are developed from the suspensor, but as far as 
the writer has been able to ascertain, this has not been recorded for 
the Scrophulariaceae. 
The embryonic haustoria are tuberous in form and do not show 
the slightest resemblance to those of the endosperm. 
The first wall of the embryo proper is formed in a longitudinal 
plane (fig. 24) and is followed immediately by another longitudinal 
wall at right angles to the first, dividing the embryo into four cells 
(fig. 25). A transverse wall is then formed, dividing the embryo 
into octants. The next walls are periclinal (fig. 26). 
Walls then follow in quick succession, giving rise to a spherical 
embryo (fig. 27) on the end of a long suspensor. The mature 
embryo is of the ordinary dicotyledonous type (fig. 28) and is sur- 
rounded by one row of endosperm cells. 
