194 BOTANICAL GAZETTE [SEPTEMBER 
Fig. 125. Transverse section of strobilus through microsporangia. In 
the center of the figure is the axial strand surrounded by air chambers inter- 
spersed with meristematic tissue. At the right and left are two micro- 
sporangia, each showing the septum which incompletely separates it into two 
loculi. The rest of the diagram represents the cross sections of six sporo- 
phylls with their ligules. 
Fic. 126. Apical portion of strobilus showing young sporophytes pro- 
truding from undetached megasporangia. 
HuLL BoTANIcaAL LABORATORY, 
THE UNIVERSITY OF CHICAGO, 
