Tg11r] CHAMBERLAIN—CYCAD TRUNK 93 
remains of the old peduncle is covered over, somewhat as in the 
case of a dead branch of a dicotyl. The apex of the cycad stem is 
remarkably broad and flat, a feature which expedites the burying 
of the peduncle by the new tissue (fig. 6). 
Fic. 6.—Dioon edule: longitudinal section of the apex of a large trunk, showing 
three cone domes, the lowest with bundles in transverse section, the middle one with 
bundles going to the peduncle of a large cone, and the upper terminating in the latest 
apex; x4. 
Cc. 
ee a .@©&6 
Fic. 7.—Zamia floridana: ance section of apex of a large plant, showing 
three cone domes (c), the lower with bundles in transverse section, the middle with 
bundles eae to peduncle (p) of a rst cone, and the upper with bundles 
a young cone; the new growing point is at the right of the young cone; 
several ss traces ). are shown; X3. 
