PALEOBOTANY BERRY. 



305 





'J 12 



Fig. 3. — Stem anatomy, foliage, and fructifications of the Paleozoic and Mesozoic Marattiales. 



1. rsaronius cottai Corda. Cross section of stem from the Fermian of Saxony (after Corda). 



2. Pecopteris arborescens (Schlotheim). A Carboniferous and Permian frond type (after fcchenk). 



3. Magnified section of sori of Asterotheca cyathea Brongn. 



4. Fertile pinnae of Pecopteris unita Brongn., with Asterotheca fructifications (after Grand'Eury). 



5. T ,vo pinnules of preceding enlarged. 



6. Asterotheca hemitelioides Brongn. (after Grand'Eury). 



7. A sorus of the preceding, enlarged. 



8. Underside of pinnule of Scolecopteris elegans Zenker from the Permian of Saxony. 



9. Transverse sec; ion of preceding, enlarged (after Strasburger). 



10. Fragment of fertile pinna of Marattia muensteri (F. Braun) from the Rhaetic of Bavaria. 



11. Synangium and spores of preceding, enlarged (after Schimper). 



12. Nathorslia angustifolia Heer, from the Lower Cretaceous of Greenland, enlarged (after Deer). 



13. A synangium of preceding, X8 (after Nathorst). 



