410 



FILICALES 



[CH. 



The Upper Triassic ferns described by Heer, Krasser\ and 

 Leuthardt^ as Bernouillia have been referred to the Marattiaceae, 

 but without trustworthy evidence in favour of this affinity. 



The large leaves, 70 cm. long and 7 cm. broad, described by 

 Zigno^ from the Jurassic of Italy as Danaeites Heeri, are 

 probably Cycadean. The Polish Jurassic species Danaea micro- 

 phylla* is a more satisfactory record. 



B 



Fig. 294. A, B. Nathorstia angustifol'ia, Heer. (After Heer. A, nat. size. ) 

 C, D. Sorus of N. latifolia, Nath. (After Nathorst. C,xl2; 

 D, x45.) 



Nathorstia. 



This name was instituted by Heer" for pieces of pinnate 

 fronds from Lower Cretaceous rocks of Greenland. The re- 

 semblance of the long pinnules to the fertile segments of 



1 Krasser (09) p. 21. 

 3 Ziguo (56) A. PI. XXV. 



2 Leuthardt (04) Pis. xix. xx. 



^ Baoiborski (94) A. PI. vi. '> Heer (80). 



