THE EVOLUTION OF PLANTS 
60S 
FIG. 426. Cycadeoidea ingens. Restoration of an expanded bispor- 
angiate cone, or flower, in nearly longitudinal section. Restored from a 
silicified fossil. (After Wieland.) 
FIG. 427. Cycadeoidea Dartoni. Tangential section through outer 
tissues of the (fossilized) trunk, showing the very numerous seed-cones. 
The seeds are very small (the illustration being natural size), and nearly 
every one has a dicotyledonous embryo. There were over 500 such cones 
on the original stem. (After a photograph loaned by Prof. Wieland.) 
