THE COMMON HART'S-TONGUE FERN. 171 
long excluding the stipites, and is normally cordate at the base so as 
to form a pair of enlarged lobes there, then contracted, becoming less 
so upwards but having rounded projecting lobes, the contracted parts 
laciniate. It resembles the laciniated forms of sinuatum (45), but 
is marginate where contracted, and forms an elegant variety. 
71. coriaceum (James). A dwarf form remarkable when fresh for 
its coriaceous texture. The fronds are irregularly inciso-dentate, and 
somewhat lobate, slightly marginate, with the margin toothed; the 
base is cordate, and the apex generally abrupt; they are sparingly 
and irregularly soriferous, the sori being borne on the under or upper 
surface, or on the actual edge of the frond. It was found in Guernsey 
by Mr. James. 
72. turgidum (Woll.). This variety has been named in allusion - 
to the thick or muddy-looking appearance of the cellular tissue 
between the veins. The fronds are coriaceous or fleshy, from six to 
ten or twelve inches long, one and a half to two inches broad, the 
margin irregularly lobate or crenate-lobate, sometimes very irregular, 
crenate-dentate, or laciniate-toothed, more or less evidently mar- 
ginate, the margination often close to the edge producing a mem- 
branous appearance there; the base is cordate and the apex not 
unfrequently forked or multifid, sometimes abrupt or sometimes very 
irregular ; the venation is irregular and occasionally reticulate. It is 
fertile, and quite permanent under cultivation ; and has been found 
in—Sussex: Week, G. B. Wollaston. Somersetshire : Nettlecombe, 
C. Elworthy. Devonshire: Barnstaple, C. Jackson ; Ilfracombe, 
J. Dodds. Yorkshire: Castle Howard, C. Monkman; Oldstead, 
C. M.; Hackness, Scarborough, A. Clapham ; Knaresborough, 
A. C.; Whitby, W. Willison. Lancashire : Todmorden, A. Stansfield. 
Westmoreland : Whitbarrow, F. Clowes. Guernsey, J. James. 
` 73. turgido-irregulare (Mz). This resembles turgidum (72), but is 
more irregular in outline, and more deeply and distinctly lobed, and 
slightly submarginate. Specimens having these peculiarities have 
been sent from Whitby by Mr. W. Willison ; and from Nettlecombe 
by Mr. Elworthy. 
74. submarginatum (Woll). This includes several subvarieties, 
not having sufficiently distinctive characters to be kept separate, the 
chief connecting peculiarity being that the fronds are only here and 

