ARCHAEOPTERIS 



PTEROPSIDA. 



59 



Archaeopteris, Dawson, 1871 1 (Figs. 28-32). Fronds of large 

 size, bipinnate with a stipular base, stipules in pairs, adnatc, and 

 a ramentiim on the lower part of the petiole. Sterile pinnules typi- 

 cally obovate or ovate-cuneate, entire or toothed, with a flabellate 



Fig. 31. Archaeopterisfissilis, Schmalh., from the Upper Devonian of Elles- 

 mereland. (Nat. size except fig. marked 9, which is xf.) After Nathorst 

 (1904). 



1 See Carruthers (1872); Kidston (1888); Nathorst (1902) and (1904); 

 White (1905); Kidston (1906), p. 434; Johnson (1911 2 ). 



