14 



MoHI'IlOLOdY OP SFEK:\[AT0I'IIYTBS 



It is of iiitei-ortt to note that immerons stomata are found on 

 the spovangiinu wall of Ceratozamia, EiiccpJiahnios, and Staii- 

 qeria, and donbtlcss in other genera. They are fonnd on the 

 wall which is oijposite to the slit of dehiscence — that is, toward 

 the sporophyll. Stomata also occur npon pollen sacs of certain 

 Angiospenns, hnt so far as recorded not upon the s])orangia of 

 Pteridoplivtes. 



The d('\'(do]inient of the sporangia, their large ont]nit (if 

 spores, their arrangement in sori, their severaHayered wall, and 

 their ih'hisccncc, are all characters snggestive of ilarattiaceae; 

 while the chief resemlilance to Angiosperms is found in the 

 livpodormal archesporimn. 



T HE il EGAS POK AXG lU II 



In most cases a definite ovulate stroliihis is organized, which 

 is terminal in Cyras, and possibly so in the other genera (Figs. 

 11, 12, 13). In Cycas the axis of the strobiliis continues 



'■/n/„. uviilatf stroliihis.— Fri.iiL pliotn,i.'i-:ii.h talu-n ill l.iiirolii Tark. 



growth after the seeds have been formed, produces foliage 

 leaves, and finally organizes another stroliilus. In all other 

 cases, incbiding tlie staminate strobilus of Ci/i'us, a strobilus 

 stops the growlh of llie axis. The size of the ovulate strobilus 



