CYCADALES 



125 



telophase, becomes obscured by other nuclear contents until it be- 

 comes unrecognizable. 



The contents of the egg become very dense. Most of the vacuolate 

 structure of the protoplasm disappears, apparently by the breaking 

 down of the thin sides of the vacuoles, resulting in a more or less 



/2V 



Ult 



125 



/27 



Figs. 124-129. — Pits in the egg membrane and haustoria: fig. 124, Cycas revoluta, 

 Xiso; fig. 125, the same, X375; fig. 126, Dioon editle before the haustorium has broken 

 the pit closing membrane; in figs. 127 and 128, the membrane has been broken and ma- 

 terial is passing directly from the jacket cell into the haustorium, XSchd; fig. 129, En- 

 cephalartos lehmanii, shallow pit with protoplasmic continuity between the haustorium 

 and the jacket cell; Xnoo. Figs. 124 and 125, after Ikeno;^*" figs. 126-128, after Cham- 

 berlain;'"^ fig. 129, after Stopes and Fujii.s!" 



fibrillar appearance. Starch, proteids, and oil can be identified. In 

 the living condition, at this stage, the outer border of the egg, which 

 may be called the "Hautschicht,^^ is as colorless as water, while the 

 interior is slightly turbid. 



