20 
FERNS. 
[ Woodsia. 
WOODSIA ILVENSIS. 
OBLONG WOODSIA. HAIRY WOODSIA. DOWNY IIAIR-FEUN. 
(Plate 1, fig. 7.) 
Cha. — F rond pinnate, oblong, scaly. Pinnae oblong, blunt, 
deeply cut, crenate. 
Syn. — Woodsia Ilvcnsis, Brown, Smith, Hook., Spreng. Polypodium 
Ilvense, Swz.,Willd., Schk. — Acrostichuin Ilvonsc, Linn., Huds., Ehrh. 
— Polypodium Arvonicum of With., in description but not in references. 
Fig. — E. B. Supp. 2616. — Flo. Dan. 391. — Pink. Phyt. 281, Jig. 4, (good.) 
Des. — Root perennial, tufted, black, smooth. Fronds numerous, 
one to four inches high, covered with capillary, brownish, white 
scales. Rachis scaly, one-third of it without pinnae, the upper 
two-thirds containing 6-10 pairs, placed nearly opposite to each 
other. Larger pinnae cut into 4-6 blunt segments on each side. 
Sori scattered, convex, consisting of five or six roundish thecae. 
Cover torn into a few capillary divisions. 
Mr. Sowerby observes, that the capillary segments of the indusium are not 
so numerous as in the next species, and the theca? more spherical. The plant 
cultivated at Kew Gardens, and sold at the London nurseries under the name 
of Woodsia Ilvcnsis, is in every respect different from our plant, which is 
much smaller, and less white and downy than that sold under its name. 
Hab. — Near Richmond, Yorks., Mr. J. Wood. Higher parts of the Tees, 
Mr. J. Hogg. Snowdon, Mr. J. E. Boioman. Rocks between Glen Dole and 
Glen Phee, Forfarshire (near where Oxytropis campestris grows), Clova 
Mountains, at 550 yards of elevation, Mr. II. C. Watson, (from which station it 
is larger than the Welsh plant). On the Basaltic Rocks, called Falcon Clints, 
near Caldron Spout, Teesdale, Mr. R. B. Bowman. Near Glyd yr-vawr, 
and near Lyn-y-cwm, Mr. Winch. Last seen in July, 1836, by Mr. W. Wilson. 
Geo. — Found in different parts of Germany, as on the Alps of Salzburg and 
Carinthia, the Giant and Hartz mountains, &c. In Sweden, Norway, and 
rocks in the isle of Elba or Ilva (hence the name Ilvcnsis), also in Italy, 
Siberia, and on the Pyrenees. Pursh says from Canada to Virginia, but it 
may be much doubted if our plant be here indicated. 
WOODSIA HYPERBOREA. 
ROUND LEAVED WOODSIA. 
(Plate 1, fig. 8.) 
Cha. — Frond pinnate, oblong, nearly smooth. Pinnae triangular, 
blunt, deeply crenate. 
Syn. — Woodsia hyperborea, Br., Hook., Smith, E. FI., Galp. — Acrostichuin 
Alpinum, Bolt. — Cctcrach Alpinum, Lam., Decan. — Polypodium hyper- 
borcum, Swz., Willd., Spreng., Smith in E. B. 
Note. — I cannot refer to Withering’s Polypodium Arvonicum and 
Ilvense with certainty, as his description of these two plants is very 
obscure and far from characteristic. 
Fig. — E. B. 2023. — Bolt. 12. — Linn. Trans, vol. 11. — Pink. Phyt. 89, /. 5. 
Des. — Root perennial, fibrous, black, tufted, and very long, giving 
