38 



POLYPODIUM VULGARE. 



Fig. 17. 



Dentatum, Monhman, MS. (Fig. IT.) — Found, I believe in 

 1859, growing upon a bridge in the grounds of Fountains Abbey, 

 Ripon, Yorkshire, by Mr. C. Monkman, of Malton. A very 

 robust form, resembling Acutuni in general outline, but when 

 well established has the lobes, especially the lower pairs, very 

 deeply toothed, and sometimes bifid. An extremely handsome 

 large-growing form, the fronds attaining eighteen inches and 

 upwards in length, and eight or nine inches in width. Sub- 

 permanent in cultivation, but tolerably characteristic if left un- 

 disturbed at the roots. When vigorous, Dentatum has a tendency 

 to approach Semilacerum in its characters, and one form has 

 grown into the other. A very handsome form of this variety 

 has been found by Mr. Clowes, of Windermere. 



Fig. 18. 



Denticulatum, Moore. (Fig. 18.) — Found near Hereford; 



