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strap-shaped and acute, in fact nearly normal, differing only in 
being slightly undulate and crenately-lobed, while the other half 
are shorter, ramose in the stipites, and multifid towards the apices 
of the branches. The plants seem to become more rigid, and to 
acquire the horn as they become more matured. 
18. perafero-cornutum (M.). This is a curious little seedling, 
raised in 1857, by Mr. James of Vauvert. It is dwarf, scarcely 
three inches high including the stipites; the fronds cordate at the 
base, somewhat wavy on the margin, and rounded and retusely 
bilobed at the apex. At the base of the apical cleft the costa 
becomes excurrent in the form of a horn, and around the lower part 
of this, on the under side of the frond, is a frilled funnel-shaped cup, 
three-fourths of an inch in diameter. 
19. cornuto-abruptum (M.). The fronds of this form are about 
six inches high and upwards of two inches broad; they are sub- 
undulated and rather irregular on the margin, abruptly rounded at 
top and somewhat lobed, the central portion with a crenate margin 
and bearing a horn as in cornutum (15). It is a constant form, and 
was found at Rivaulx Abbey, Yorkshire, by Mr. C. Monkman. 
20. marginato-cornutum (M.). This is a dwarfish plant, the 
lamina of the frond measuring from three to six inches long. It is 
subtruncate at the base, narrowish, oblong, blunt and rounded at 
the apex, and cleft into numerous narrow lobes along the margin. 
The fronds have an excurrent soriferous membrane beneath, as in 
marginatum (59); and the costa is developed on the lower side into 
along horn. It has been raised as a seedling by Mr. Wollaston, 
and is quite constant; a similar seedling has also been raised by 
Mr. Jackson of Barnstaple. 
The varieties sagittato-crispum (8), vivo-polyschides (21), inter- 
ruptum (30), rugosum (78), and multiforme (125), are also sometimes 
cornute. 
Polyschides and Sinuatum Series. 
21. polyschides (Ray). This variety, named in allusion to the 
numerous deep incisions on its margins, is sometimes met with in 
gardens under the name of angustifolium. The fronds are narrow, 
strap-shaped, from six inches to nearly a foot in length, and about 

