204 



MORPHOLOGY OF ANGIOSPERMS 





13* 



gaea; Onobrychis petraea, in which the proembrvo is a globular 

 mass of cells; and Phaseolus multiftorus and Erythrina crista- 



gatli, in which the massive pro- 

 embrvo is elongated and there 

 is no superficial separation be- 

 tween embryo and suspensor. 



In case two or more of the 

 first divisions are transverse, 

 forming a filamentous proem- 

 brvo, the end-cell forms the en- 

 tire embryo, the suspensor-cells 

 becoming relatively extremely 

 large and bladdery inflated. 

 Two general types may be noted. 

 In Orobus august if olius, 0. au- 

 reus, Pisum sativum, Lathyrus 

 heterophyllus, L. odoratus, Er- 

 vum Errilia, and Vicia navbon- 

 nensis, a proembrvo consisting 

 of a row of three cells divides 

 longitudinally ; the two basal 

 cells become much elongated, 

 bladdery inflated, and multinu- 

 cleate; the middle pair become 

 bladdery inflated and multinu- 

 cleate ; and at the end of such a 

 suspensor the terminal pair of 

 cells organize a small round, 

 oval, or elongated embryo. In Cicer arietinum it is interesting 

 to note that the same huge suspensor and small embryo appear, 

 but the suspensor-cells instead of becoming multinucleate 

 divide, forming a many-celled massive suspensor. In the other 

 type, transverse divisions continue until the proembrvo consists 

 of a long filament of cells, all of which, excepting the end-cell; 

 form a suspensor, as in Medicago falcata; Galega orientalis, in 

 which the long suspensor finally becomes massive by longitu- 

 dinal divisions; and Ononis fruticosa, in which the suspensor- 

 cells become very large and rounded, forming a chain that 

 finally breaks up. In Ononis alopecuroides, however, the sus- 

 pensor is reduced to a single cell. The genus Lupinus is espe- 



Fig. 97. — Embryos of Leguminosae. A, 

 Orobus angustif olius, with suspensor 

 of three multinucleate cells; x 336. 

 B, Ciar arietinum, with large multi- 

 cellular suspensor and small embryo 

 («); x 160.— After Goignabd.m 



