264 THE BRITISH FERNS. 
Humber.—Yorkshire: Settle; also rather broader and somewhat 
irregular, A. Clapham; Wensleydale; Gordale, Craven. 
Lakes.- Cumberland : F. Clowes. Westmorland : W hitbarrow, F. C. 
N. Wales.—Carnarvonshire: Llanberris, Lhwyd; also a very 
slender form, J. Atkins. 
E. Lowlands.—Edinburghshire : Pentland Hills. 
E. Highlands. Perthshire : Ben Lawers, T. M. 
Connaught.—Sligo : Lough Gill, R. Barrington. 
2. obtusa (M.). This is a distinct and constant form under culti- 
vation. The fronds are dark green, nearly or quite a foot in 
height, and of a lanceolate form’; they are peculiar from their short 
blunt ovate or roundish-ovate narrowly and shortly stalked pinnules, 
which are deeply pinnatifid into blunt oblong lobes, notched with 
small narrow but bluntish teeth, which are sometimes very evident; 
the spores are echinate. It was found in Scotland by Mr. A. Tait. 
We refer here specimens from— Yorkshire: Newton Vale near 
Whitby, A. Clapham. Westmoreland : Kentmere, F. Clowes ; Whit- 
barrow, G. B. W. Cumberland: Borrowdale, G. B. Wollaston. 
Carnarvonshire: Llyn Ogwen, S. O. Gray. | 
3. dentata (Hook.). The fronds of this elegant form are usually 
of small size, four to eight inches long, narrowish, bipinnate, or with 
more or less confluent pinnules, so that the narrow fronds are 
sometimes scarcely bipinnate ; these pinnules are blunt oblong, blunt- 
toothed, or obscurely blunt-lobed, and the sori are placed near their 
margin, the centre of the pinnule being clear. Somewhat larger 
and more deeply lobed forms, having the same aspect, are met with, 
and through these it gradually merges into obtusa, and thence into 
the normal state. There are some of the cultivated forms of this 
variety that are certainly constant, though it is probable from its 
being often looked on as inconstant, that accidentally blunt- 
pinnuled plants of the common form are sometimes associated with 
it. The spores are echinate, but scarcely in so marked a degree as 
they are in the more typical forms of the species. [Plate CII A.] 
This variety has been met with in the following habitats :— 
Peninsula.—Somersetshire : Cheddar. 

