I02 



GYMNOSPERMS 



part of the rachis is suppressed, but there are often serrations repre- 

 senting the pinnae. In the rest, reduction has gone still farther, so 

 that the sporophyll is merely a thick peltate structure bearing scarce- 

 ly any resemblance to a leaf. 



Fio. 94. — Macrozamia denisoni: female cone nearly a meter (37 inches) long, and 

 weighing 38.5 kilos (85 pounds).— From a photo taken on Tambourine Mountain, near 

 Brisbane, Australia, by Miss Hilda Geissuann. 



It will be remembered that in the Benncttitales the strobili are 

 prevailingly bisporangiate. The reduction from the bisporangiate 

 condition to the dioecious is a general tendency in plants. The re- 



