Figs. 299, 300. — Thuja occidentalis: archegonium complex; fig. 299, longitudinal 

 section of upper portion of endosperm with three of the elongated archegonium initials; 

 X4S0; fig. 300, later stage with necks breaking down; the nuclei of the central cells 

 have not yet divided to form the ventral canal nucleus and the egg nucleus; the pollen 

 tube, with its body cell and stalk and tube nuclei, has almost reached the archegonium 

 coiQDlez: X.S40. — ^After Land (72). 



