WOODSIA. (Hi 



tooth or lobule and near the sinus, involucres glabrous very 

 thin and fragile soon breaking down into spreading lobes, 

 stipes and rachis ])artially chally. Physeniatiuni obtusuni, 

 Hook. 77. lior. Am. r. ii. p. 2o}). Asjjidiuni obtusum, WiUd, 

 Schkiihr, Fil. t. 43 {Jiyitre had). Ptirsh, Am. v. ii. p. 2G2. 

 Polypodiuni obtusum, Sic. Sdikuhr, Fil. t. 21. Woodsia Per- 

 riniana, Hook.et Grev. Ic Fil. v. i. /. 08. Pliyscnialiuni Perrini- 

 anum, Kze. Anal. P/erid. p. 43. Alsophila Perriniana, Spreiiy. 

 Hah. United States of America; Pennsylvania to Virginia, PursA. Ken- 

 tucky, Dr. Short, Mr. Peter. West side of tlic Rocky Mountains, near the 

 sources of the Cohinihia, Ddiii/las, Drummnnd. — It is prohahle, as suf^f^ested 

 in the 'Flora Borcali-Americana,' that this Fern is not a native, though it 

 has been so stated, of the West-Indies. It seems to be wholly confined to 

 North America, and I possess unusually fine specimens, 12 — 14 inches long, 

 from Dr. Short of Kentucky. It is a most distinct and well-defined species : 

 and is assuredly the old Aspidiuin obtusum of American authors. 



8. W. i/tcisa, Gill. Hook. & Grev. ; fronds broad-lanceo- 

 late minutely glanduloso-pilose pinnated, pinn;e ap])roxiniate 

 subo}i])osite sessile oblong obtusely attenuated deeply ])inna- 

 tihd sometimes again pinnate, segments or pinnules oval pin- 

 natifidly lobed and toothed or incised the teeth obtuse, sorus 

 solitary on each lobule near the sinus, involucres glabrous 

 very thin and fragile soon breaking down into spreading lobes. 

 Hook, el Grev. Ic. Fil. t. 191. Physematium incisum, Kunze, 

 Anal. Plerid. p. 43. 



Hab. Shady mountain rocks, near IMendoza, and San Luis de Cordova, 

 Argentine Republic, Dr. Gillies. — Quite distinct from the preceding and 

 from every other species, and apparently only discovered in the locality 

 above mentioned. 



Subgen. III. Woodsia vera. Involucres minute, pateriform, cO' 

 vercd and concealed by the capsules, the lone/ hairs of the 

 margin only projecting beyond the sorus. Stipes with a 

 joint. Hook. GiiN. Fil. TAB. 119. 



9. W. Ilrensis, Br.; slightly hairy above, stipes rachis cos- 

 ta and nerves below crinite and clothed with copious rufous 

 chady scales, frond broad-lanceolate, pinna) oblong obtuse 

 broader at the base sessile deeply pinnatifid with many ob- 

 long obscurely crenated somewhat coriaceous segments. — Br. 

 ill Linn. Trans, r. xi. p. 173. Hook, in E, B(d. Siippl. I. 

 20 1(). Poly])odium, Su\ Acrostichum, Linn. Nephrodiuin 

 rufidulura. Ph. 



Hab. Rocks; northern part of tlie northern hemisphere as far as Green- 

 land ; and mountaiiu)us regions in the temperate countries. Altai niountiiins, 

 Jhnujc. Rare in Britain ; Wales and Yorkshire. 



10. W. hypcrhorca, lir.; glabrous or with the sti|)es rachis 



