Am. 2. p. 662.—Polypodium, Sw.—Woodsia Perriniana, Hook, et Grev. Ic. Fil. 1. t.
68.—Alsophila Perriniana, Spreng.
H ab. West side of the Rocky Mountains, near the sources of the Columbia, Drummond: and elsewhere on
the higher parts of the Columbia. Douglas.—This is the Alsophila Perriniana of Sprengel, and it is perhaps
by some mistake that it is said to be a native of St Thomas. It seems however to have a wide range in
N. America, yet to be found nowhere plentifully.—The Genus is distinguished from Woodsia, to which it
is very nearly allied, by the presence of an hemispherical indusium which covers the whole sorus and then
splits from the top into several lacinated segments.
5. CISTOPTERIS. Bemh.
1. C.fragilis, Bemh.—Athyrium, Rich. App. p. 39.—Cyathea, E . Bot. t. 1587«—Ph.
—jS. laciniis latioribus minus divisis. C. tenuis, Schott.—Aspidium tenue, Willd.—Ph.
—Nephrodium, M x.
H ab. Canada, Mrs Perceval, Goldie; to Slave Lake and to the Rocky Mountains. Dr Richardson.
Drummond.—This species varies a good deal in North America ; but not more so than it does in Europe.
The C. tenuis is only a form with broader and less deeply divided lacinias.
2. C. montana, Link,—Aspidium, Sw.—Schkuhr, Fil. t. 63.
H ab. Shady alpine woods by streams in the Rocky Mountains. Drummond.—This is quite new to the
Flora of N. America. The specimens entirely accord with Europsean ones. The species cannot indeed
readily be mistaken, well marked as it is by its small exactly triangular and much divided frond, with the
fructification precisely resembling that of C. fragilis.—May not the Aspidium atomarium, Muhl. and
Willdenow, be a variety of this plant ?
3. C. hulbifera, Bemh.—Aspidium, Sw.—Schkh. Crypt, t. 57.—Ph.—Nephrodium, Mx.
H ab. Canada. Mrs Sheppard. Goldie.
6. ASPIDIUM. Sw.
]. A. (Lastrea) Thelypteris, Sw.—E . Bot. t. 1018. Schkh. Fil. t. 52.—A. thelyp-
teroides, Sw.—Nephrodium,M x Aspidium Noveboracense, Sio.—Ph—Schkh.Fil. t. 46.
H ab. Canada. Michaux. Mrs Perceval. Mrs Sheppard.—The A. Noveboracense is quite identical with
A . Thelypteris.
2. A. (Lastrea) Goldianum, Hook, in Ed. Phil. Joum. 6. p. 333. Hook, et Grev. Ic.
Fil. t. 102__ A. Filix Mas, Ph. Am. 2. p. 662.
H ab. Canada. D r Holmes. About Montreal. Goldie. Mrs Perceval. Mrs Sheppard.—This is a most
distinct species, and though apparently rare in British N. America, seems to be common in the United States,
whence it is not unfrequently sent as A . Filix M as: and there is every reason to believe that this is what
Pursh had in'view for that plant.
3. A. (Lastrea) marginale, Willd.—Ph.—Schkuhr, Fil. t. 45. b.
H ab. Canada. Mrs Sheppard. Mrs Perceval, to the Saskatchawan. Dr Richardson. Drummond.
4. A. (Lastrea) cristatum, Sw.—E. Bot. if. 2125 (not t. 1949.) Ph.
H ab. Saskatchawan. Dr Richardson. Drummond.—The specimens are barren, but the form of the plant
is so remarkable, as to leave not the shadow of a doubt as to its being the real A . cristatum, which, moreover,
is frequent in the United States.
5. A. (Lastrea) fragrans, Sw.—Hook, in Parry’s 2d Voy. App. p. 410.—Nephrodium,
Rich. App. p. 39. Hook, et Grev. Ic. Fil. t. 70.
H ab. Saskatchawan to the Arctic Sea-coast and Islands. D r Richardson. Sir E. Pprry. Drummond.—
Some of the specimens from about Bear Lake are nearly a foot in length.
6. A. (Lastrea) spinulosum, Willd.—E. Bot. t. 1460. Bong. Veget. Sitcha, p. 57. Ph.
Am. 2. p. 663.—A. intermedium? Willd.—Ph.—13. A. dilatatum, Willd.—E. Bot. 1.1461-
Bong. Veg. Sitcha, p. 57. Ph. Am. 2. p. 663.—A. dumetorum, Sw.—Nephrodium
expansum, Presl, Reliq. Haenk. 1. p. 38.
H ab. Newfoundland. Miss Brenton. Canada, {Mrs Perceval, Lady Dalhousie,) to the Rocky Mountains.
Dr Richardson. Drummond. Columbia River. Dr Scouler. Douglas— In America this plant,
although at all times easily recognised, is as variable as in England ; and it is equally impossible, as with us»
to limit the marks of the varieties.
-7 . A. (Polystichum) Lonchitis, Sw.—E .Bot. t. 797.
H a b . Rocky Mountains. Drummond.
8. A. (Polystichum) munitum {Kaulf.) ,* frondibus pinnatis, pinnis lineari-lanceolatis
spinoso-acuminatis subfalcatis basi sursum auriculatis mucronato-serratis, serraturis sub-
appressis rarissime bidentatis, stipite rachiqae subtus et basin versus paleaceis.—Kaulf.
Enum. p. 230. Hook. etAm. Bot. o f Beech. Voy. p. 162, and 405.—Nephrodium Plumula,
Presl, Reliq. Haenk. 1. p. 33.
Hab. N. W. America. Menzies. Douglas. Dr Gairdner. Nutka. Mertens.—The most common of all
Ferns on the N. W. Coast, between the parallels of 40° and 49° n. lat., in the moist grounds of the dark
shady Pine Forests. The roots are roasted on the embers, and constitute an article of food. The fronds are
used as garlands by the Indians. Douglas.
9. A. (Polystichum) acrostichoides, Sw.—Ph— Schkh. Fil. t. 30— Sephrodium, Mx.
H ab. Canada. Mrs Perceval. Mrs Sheppard.
10. A. (Polystichum) aculeatum, Sw.—E. Bot. t. 1562. {ic. mal.) Hook. Br. FI. ed.
4. p. 384.—A. vestitum, Sw_Schkuhr, Fil. t. 43. Bong. Veg. Sitcha, p. 57. (et in Herb.
nostr.') Nephrodium setigerum, Presl, Beliq. Haenk. 1. p. 37.
H ab . Portage, and sources of the Columbia, west side o f the Kocky Mountains. Drummond. Nutka.
Haenhe. Sitcha. Mertens.—This is a rare plant in N. America; and the form is precisely that which I
have characterized as the Asp. aculeatum in British Flora,” ed. 4. v. 1. p. 384, a state exactly intermediate
between A . lobatum on the one hand, and A. anguldre, Sm., on the other. Pursh recordsftas au inhabitant
of the Green Mountains, Vermont; Mertens discovered it at Sitcha ; and my correspondent, Dr W. F.
Macrae of Montreal, Canada, has lately communicated specimens to me which he had the good fortune to