82 



GYMNOGRAMMOID FERNS 



[CH. 



medifolid). In others, as in Pteridella Kuhn, sub-sec. A, the trace is diarch, 

 a feature which goes with a reticulate venation, and an almost Ptcris-\\V& 

 marginal sorus {P. Holstii Hieron, Fig. 636, F): these details indicate an 

 advanced state. 



Fig. 636. Pellaea Link. A, B = P. falcata (R. Br.) Fee : A = habit, B = part of a pinna with venation 

 and sori. C = F. atropurpurea (L.) Link. D = P. ornithopus Hook., part of a leaf. E=P. m'vea 

 (Lam.) Prantl, part of a leaf. F=P. Holstii Hieron, part of a pinna with venation and sori. G=P. 

 j>teroides (Thunb.) Prantl, part of a leaf. H=^ pinnule of the same, with venation and sori. {B is 

 after Hooker: all the rest after Diels.) 



