THE COMMON HARTS-TONGUE FERN. 181 
sometimes contracted and finely toothed. It was found in the Isle 
of Wight by Mr. R. Bloxam. 
98. tortum (M.). A thoroughly distinct and beautiful variety, of 
dwarfish habit, the fronds being from six to eight inches high, and 
about an inch and a half broad in the middle, rather narrower 
above and below, cordate at the base, and multifid erisped at the 
apex; the margins are finely undulated, but the chief peculiarity 
is the production of numerous minute projecting pointed lobes 
which, being curled, have the appearance of being hooked or twisted 
in all directions; this is more marked in the larger specimens than 
in the small one, which was more convenient for our illustration. 
The fronds we have seen are sterile. It was found in Guernsey by 
Mr. James, and is one of the most charming of recent additions to 
the forms of this polymorphous species. [Plate XCI bis, B. ] 
99. crenato-crispum (Monkm.). This is a large form, nearly a 
foot long and two inches wide, deeply divided into roundish lobes, 
as in the more regular forms of sinuatum (45), but the margin of 
the frond is erisped, so that the lobes overlap. It is a fertile plant, 
and appears quite distinct. It was found by Mr. Monkman, at 
Kirkham near Malton, Yorkshire, in 1858. 
100. undulatum (M.). This variety has the margins regularly 
wavy or eurled as in crispum (91), but they are considerably less 
crispy, and the fronds are narrower, and, unlike that, constantly 
fertile. "The fronds are cordate at the base, acute at the apex, the 
larger ones nearly a foot long, and about an inch and a half wide. 
The plant is often confounded with crispum, and is probably not 
uncommon. We have information of its occurrence 1n —Devonshire : 
Torquay, R. J. Gray. Somersetshire: Nettlecombe, C. Elworthy. 
Hampshire: Fareham. Denbighshire: Ruthin, T. Pritchard. York- 
shire: Oswaldkirk, Helmsley, A. Clapham; Whitby, J. Willison. 
Antrim: Colin Glen, Belfast, A. Crawford. 
101. undulato-lobatum (M.). This differs from undulatum only 
in being several times forked at the apex, the branches of each 
division spreading and forming a peculiar head of curly segments, 
but not a cristate tuft. It is an old well-known garden plant and 
constant. It has been found by Mr. Wollaston at Littlehampton in 
Sussex, and by Mr. James in Guernsey. Mr. Wollaston has also 

