BRITISH FERNS 



Fig. 210. P. v. suprasoriferum. 



Fig. 211. P. v. Tkompsonii. 



Suprasoriferum (Fig. 210). — Found in Sussex by Mr. G. B. 

 Wollaston ; subdivisions narrow and irregularly toothed, a la 

 marginatum ; spore heaps often on upper surface at the edges, as well 

 as on frond backs. 



Thompsonii (Fig. 211). — Found near Whitby by Mr. George 

 Thompson ; an obtuse, dense, almost imbricate form. 



Truncatum (Fig. 212). — Found in Ireland by Dr. Allchin, and at 

 Windermere by Mr. Clowes ; pinnae minutely saw-toothed, fronds 

 sometimes abruptly terminated, midrib projecting like a thorn. 



