FITZROYA: see Fig. 42 G, H, p. 26. 



GINKGO: 



21 



I I 



Fig. 32. Ginkgo biloba; extreme left (letail-figure: pollen grain in lateral, 

 longitudinal view with an outline of the accompanying median transverse 

 section. Second detail-figure from the left: pollen grain sUghtly tilted with 

 the entrance to the concavity which lotlges the tenuitas shown to the left. 

 The remaining figures exhil)it the distal face of an unexjjanded and an ex- 

 ])ande(l grain. The lower detail figure of the latter gives the outline of a 

 pollen grain in lateral transverse view (owing to an omission a full line 

 uniting the upper extremities of the figure is not shown), x 1000. 



GLYPTOSTROBUS:— 



Fig. 33. Ghjptostrohiis pensilis. From left to right: opened gi'ain (x 250); 

 lateral view, surface and optical section (x 1000); exine stratification 

 ( X 2000); LO-patterns. Uppermost detail-hgure: tenuitas (optical section; 



X 2000). 



