122 



MORPHOLOGY OF GYMNOSPERMS 



ordinary pinnate leaves. The Cycas condition resembles that of 

 the Cycadofilicales, and not at all that of the Bennettitales. How- 



Fig. 112. — Dioon edule: ovulate cone (30 cm. in length) in the center of the 

 crown; some of the leaves have been trimmed away. — After Chamberlain (46). 



ever, the staminate sporophylls of the Bennettitales are borne like 

 the ovulate sporophylls of CycaSt the principal difference being that 



