I'k;. ioo. — Diagram showing the reduction of the megasporophyll and the evolution 

 of the cone. A, Cycas revoluta, with leallike megasporophyll; /*', mcgasporophylls in a 

 loose crown, not compacted into a cone; B, Cycas media, Icatlets of the megasporophyll 

 reduced to serrations; G, the grouping of mcgasporophylls in early stages makes the 

 crown of sporophylls look like a cone; C, Dioott editlr, the leatlet character is lost, and 

 G, the sporophylls, are compacted into a loose cone; I), Macrozavtia miqiielii, the midrib 

 of the leaf represented by a spine, and /, the sporophyll compacted into a tight cone; 

 E, /.amiajloridaua, sporophylls with liardly any resemblance to a leaf, and J , compacted 

 into a very tight cone. — From Cuamberl.\in, Elements of Plant Science"^ (McGraw- 

 Hill Book Co.). 



