THE EMBRYO 



201 



which is at a considerable distance from the micropylar end 



of the embryo-sac (Fig. 93). 



In Xelumbo Lyon 75 states that there is no suspensor, but 



that the divisions of the egg result in a large spherical body 



that is still undifferentiated when 

 consisting of several hundred cells, 

 recalling the Pistia type among 

 Monocotyledons. In Ceratophyl- 

 lum demersum Strasburger 84 has 

 found the same undifferentiated 



FIG. 93. Myoporum serratum. Young 

 embryo with very long suspensor 

 embedded in endosperm. After 

 BILLINGS. 



B 



FIG. 94. Barringtonia Vriesei. A, young 

 proembryo; B, later stage, showing 

 differentiation into embryo (e) and 

 suspensor (s) ; x 104. 



spherical embryo of hundreds of cells and with no suspen- 

 sor ; while in NympJiaea Conard 81 finds the same type, but 

 associated with it is a suspensor consisting of a row of 

 three to five cells. In HecJceria (Piperaceae) Johnson 86 has 

 described the early stage of the embryo as a globular mass 

 composed of several hundred cells undifferentiated except for 

 a rudimentary suspensor; and in Cynomoriwn (Balanophora- 

 ceae) Juel 93 describes the embryo as a small spherical mass 

 of cells with no suspensor and no differentiation into body 

 regions. 



In Barringtonia Vriesei, one of the Myrtaceae, Treub 27 

 has described a broad mass of tissue almost filling the micropy- 

 lar end of the embryo-sac. At first the mass is homogeneous, 



