dspidium.'] 
FERNS. 
39 
more robust), thereby differing from the first or normal state of the plant, which 
alone approaches the last species in occasionally decurrent and convex pinnules. 
Sit. — Common in hedgerows, damp banks, &c., chiefly in the South. 
IIab. — Scot. : Peasebridge, Dr. Johnston. — Eng.: Near Richmond, Yorks., Mr. 
J. Tatham. Burton Wood, near Warrington, Lane., and in Cheshire, Mr. Ry lands. 
Ulverscroft I’riory, Charnwood Forest, Rev. A. Bloxam. Isle of Man, Mr. Forbes. 
Derbyshire, Dr. Howitt. Warwickshire, Rev. IV. T. Bree. Somerset, Mr. A. 
Soutby. Little Worley Common, Essex, Mr. R. Castles. About Tunbridge 
Wells and elsewhere, Kent (abundant), and near Bramsliot, Hants, Mr. W. 
Pamplin. Osterley Park, Lampton Lane, and Sion Lane, near Brentford, Midd., 
Mr. J. Bevis. Near Hastings, Mr. W. C. Trevelyan. Sussex, Rev. G. E. Smith. 
Kingsteignton, Mr. Anderson. Near Gurnet Bay, Isle of Wight, Prof. Hensloiv. 
— Wales : Near Wrexham, Denbighs., Mr. J. E. Bowman. Cickle, near Beau- 
maris, Anglesea, Mr. IV. Leiyhton. Near Bangor and Caernarvon, Mr. W. Wilson. 
— Ire. : Colin Glen, Belfast, Mr. MacJcay. Hedge-banks near Carrickfergus, 
Mr. F. IVhitla. (3. Intermixed with, and even more common in the extreme south 
of the kingdom than the first state of the plant, y. Near Clonmel, Mr. G. S. Gough. 
Geo. — Europe generally ; Arabia; Cape of Good Hope, North Africa; on the 
Green Mountains, Vermont, and other places in North America. 
B. Lastr.ea . — Indusium roundly kidney -shaped, fixed by the notch. 
4. — ASPIDIUM THELYPTERIS. 
MARSH SHIELD-FERN. 
(Plate III, fig. 1.) 
Ciia. — Leaf pinnate, erect. Pinnae linear-lanceolate, pinnatisect, 
smooth. Segments with a short bristle at the tip. Sori small. 
Rootstock creeping. 
Syn. — Aspidium Thelypteris, Swz., Willd., Smith, Hook., Gulp., Mack., Pursh. 
— Polypodium Thelypteris, Lin., E. B., Dicks., Ehrh., With., Light/, (not 
of ITuds.) — Acrostichum Thelypteris, Linn., Bolt. — Athyrium Thelypteris, 
Spreng. — Polystichum Thelypteris, Roth. — Lastnea Thelypteris, Presl., 
Newm. — Hemestheum Thelypteris, Newm., 1854. 
Fig. — Flo. Dan. t. 7G0. — Bolt. 43, 44. — Newm. page 123 (ed. 1854). 
Des. — Rootstock creeping, furnished with long, black, slender, 
rather smooth runners, giving rise at various points along their 
surface to black radical fibres, and erect, light-green, smooth, ovate, 
or (when fertile) oblong leaves, each from G to 12 inches long, 
having a slender, and generally smooth stalk. Pinnae linear- 
lanceolate, pointed, deeply pinnatisect, stalked, opposite. Segments 
oblong, obtuse, occasionally with a very small point; the first 
upper segment on each pinna much longer than the others. Sori 
in longitudinal lines near the margin of each segment, small, brown 
or black, at first distant, afterwards confluent. Indusium small, 
thin, white, round, kidney-shaped, fastened near the centre, and 
soon lost among the growing thecae. The barren leaves differ much 
from those which are fertile ; they are altogether wider, shorter, and 
flatter, with the pinnae horizontal, and stalk void of pinnae half way 
