only, and otliors one or moro fronds on a plant, affected; but the
most marked have the whole plant affected more or less, and when
perfect these are very handsome objects. The fronds are from six
inches to a foot long, and from one to two inches broad ; the base
truncate or cordate, the apex obtuse or acute or sublobate, and the
margins exterior to the mombrane-like line irregularly lobod or
laoiniate-toothed, sometimes undulated. Tho exourrent membrane
forms a slightly sinuous hne on each side of the rachis, reaching in
the well-marked fronds from the base to the apex, and sometimes
so distinctly-marked as to produce the appearance of a narrow frond
of normal form superimposed on an undulated or laoiniated variety.
The plant first observed, was received from Epernay by Air. S. F.
Gray, hut various English forms have since been obtained in—
Yorkshire: Settle, A. Clapham. Cornwall: Penryn, G. Bawson.
Devonshire ; Ilfracombe, Rev. J. M. Chanter; Torquajq and Dun-
chidcock, R. J. Gray. Somerset: Nettlecombe, C. Ehcwthy.
Sussex: Rev. W. H. Hawker. Hampshire: Petersfield, G. B.
Willaston. Isle of AVight, R. Bloxam. Surrey, Dr. Allchin. Guernsey,
C. Jackson, J. James (very fine). A beautiful form with the
fronds sublobate undulate and dentate at the margins, and having
the membranous line strongly developed, and in many oases placed
near the costa, as in the Epernay form above mentioned, has been
raised from spores by Air. Clapham. [Plate LXXXVII A.]
57. supralineato-resectum (AI.). The fronds of this elegant and
permanent form are lanceolate, being tapered off in a curving line to
the base, and attenuate at the apex; they are from six to eight
inches long, and an inch or an inch and a half wide in the broadest
part; the margin is crenately toothed. The fronds are distinctly
supralineate, and fertile. It was found in Guernsey by Air. James.
58. supralineato-lobatum (AI.). An elegant form growing about
eight inches high, with the fronds subcordate at the base, and hut
slightly suprahneate, orenate-lobate on the margin, and lobate or
multifid at the apex. This has been found at Nettlecombe by Air.
Elworthy. A still more beautiful form, having the supralineate
character more strongly marked, especially in the upper or lobate
portion, has been found in the Isle of AVight by Air. E. Bloxam.
69. marginatum (AI.). This remarkable form, though hut recently
described, must have been long known, as a garden specimen received
from the younger Linnaius is preserved in the Smithian Herbarium.
In the most characteristic plants the fronds are erect, a foot or more
in height, and about an inch in breadth; the base subtruneate, and the
apex attenuated, the margin irregularly lobed, and dentate. On the
under surface is borne within the margin an excurrent membrane,
which is also lobed; the fronds have therefore, as it were, a double
margin, and both surfaces of this membrane, and the under surface
of the frond itself exterior to it, are soriferous, in the more vigorous
state, while in a less perfectly developed condition the membrane
is reduced to a longitudinal vein-like ridge. This was found at
Nettlecombe, by Air. 0. Elworthy. Other forms of the variety have
since been found in many localities :—Somersetshire: near Sel-
worthy, Mrs. Archer Thompson; Alinehead, W. Bowden. Devonshire
: Ilfracombe, Bev. J. M. Chanter (several forms); Combo
Alartin, Rev. J. M. Clmnter. Cornwall: Enys Penryn, G. Bawson.
Sussex: Littlehampton, G. B. Wollaston. Isle of AVight, R.
Bloxam. Gloucestershire: Stroud, W. M. Cooper. Yorkshire:
Grassington, AVharfedalo, A. Clapham. Guernsey, J. James (fine).
[Plate LXXXVI A.]
There is in the possession of Air. AVollaston, a form of this variety,
with multifid apices, purchased of Potter, a well-known dealer, since
dead, the history of which cannot be traced; and from this, which
is a tall growing form, the pigmy variety proliferum (68) has been
raised, as well as plants exactly resembling itself.
60. marginato-fimhriatum (AI.). This is a narrow form, with the
base subcordate, and the margin of the frond fringed with small
prominent and tolerably regular teeth. This form, found in North
Lancashire, near Cartmel, by HiHman a collector, has been sent by
Air. F. Clowes; and a similar one from Silverdale, Yorkshire,
by Alessrs. Stansfleld.
61. marginato-flssum (AI.). This form of marginatum (69) has
a broad cordate base, and an acute or attenuated apex, the margin
deeply cleft into narrow obtuse lobes. It is a Devonshire variety,
and has been sent from Barnstaple by Air. C. Jackson ; and from
Ilfracombe by Air. J. Dodds.
62. marginato-irregulare (AI.). The fronds of this dwarfish
- H i '