452 



BENNETTITALES 



[CH. 



FIG. 563. Williamsonia scotica. Megasporophylls and interseminal scales in 

 longitudinal section. A, part of the axis showing the attachment, s, of a 

 scale and megasporophyll. B, apex of micropylar tube showing funnel-shaped 

 cavity and papillose epidermal cells on the integument and on the adjacent 

 scale; a, apex of nucellus. C, upper part of a scale and megasporophyll; 

 a, apex of nucellus. (A, ca. x 20; B, C, x 100.) 



