XXVIl] 



ALETHOPTERIS 



575 



triangular form divided into pinnate branches replaced in the 

 apical region by linear segments. The pinnules, 8 — 30 mm. long 

 and 3 — 5 broad, are linear- or oval-lanceolate with an obtuse 

 apex; the upper margin of the lamina is slightly contracted at 

 the base, while the lower edge is decurrent. 



Fig. 375. Alethopteris Serlii (Brongn.). From a specimen in the York Museum, 

 f nat. size. 



Alethopteris Serlii (Brongniart)^ Fig. 375. 



This species, figured by Parkinson in 1811, closely re- 

 sembles A. lonchitica, but is distinguished by the more crowded 

 and relatively longer pinnules which are joined to one another 

 by a narrow connecting lamina (Fig. 375). The secondary 

 veins in A. Serlii are rather finer and more numerous. Grand'- 

 Eury^ records the association of the seed Pachytesta with fronds 

 of this species in the Coal-Measures of St Etienne. 



1 For synonymy, see Kidston (94) p. 596; (03) p. 806; White (99) p. 117. 

 8 Grand'Eury (04). 



