DIV. I 



PTERIDOPHYTA 



521 



2 



FIG. 488. 1, Archaeocalamites radiatus. (After STCB.) 2, Annularia stdlata. (After SEWARD.) 

 From LOTSY, Botan. Stammesgesvhichte. 



FtQ. 489. l t Calamostachys Binneyana, Cone in longitudinal section. 2, The same in transverse 

 section. 3, Calamostachys Casheana, Transverse section of a sporangiophore, showing the stalk 

 and three macrosporangia and one microsporangium. k t Palaeostachya, Longitudinal section 

 of cone with axillary sporangiophores. (After SCOTT and HICKLING. From LOTSY.) 



