xxi] 



MATONINEAE 



359 



1829. Pecopteris caespitosa, Phillips, Geol. Yorks. p. 148, PL viii. fig. 10. 



— P. crenifolia, ibid. PL vill. fig. 10. 



— P. ligata, ibid. PL viii. fig. 14. 



In habit this species closely resembles Matonia and Matoni- 

 diinn, the long petiole divides distally into several spreading 



Fig. 266. Laccopteris pohjpodioides ifiiongn.). ( x 14.) (Brit. Mus.) 



pinnatifid pinnae with linear ultimate segments (fig. 278, A). 

 Circular sori (indusiate ?) occur in a single row on each side of 

 the midrib containing 12 — 14 large sporangia (fig. 266) cha- 

 racterised by an obliquely vertical annulus. The midrib of the 



Fig. 267. Pinnules of Lacco/i^-cis. (Enlarged.) 



A, B. From the Inferior Oolite of Yorkshire. 



C. From the Interior Oolite of Stamford. (British Museum.) 



pinnules gives off secondary veins at a wide angle and these 

 form a series of elongated meshes parallel to the median rib, 

 as in the recent genus Woodivardia; forked and anastomosing 

 branches are given off from these to the edge of the lamina 

 (fig. 267). 



