FILICES. (FERNS.) GDI 



2. W. hyperb6rea, K. I'rown. Frond narrowly oblonp^-lanceolate (2- 

 6' lon<; by 8- 12" wide), siiiuotli above, sj)aringly paleuceous-hirsute beneath, 

 pinnate ; the piunaj trian^uhir-ovate, obtuse, pinnately lobed, the lobes few 

 and nearly entire ; fruit-dots rarely couHuent. — Mountain ravines, northern 

 \'t. and N. V., and northward; rare. (Eu.) 



3. W. glabella, H. Brown. (PI. 19, fig. 1-3.) .Smooth and naked 

 throuijkout ; frond lintur and very delicate (2- 5' high), pinnate; pinmr round- 

 ish-ovate, the lower ones ratlier remote (2-4" long), obtuse, ereuatelv lobed; 

 fruit-dots scanty ; the hairs of the indusiuni fewer tiiau in the last two species. 

 — (Jn moist mossy rcjcks, mountains of nortlieru New Eug., north and west- 

 ward. First found at Little Falls, N. Y., by Dr. Vasei/. (Eu.) 



* * K^talks not articulated ; fronds never chaffy y often glandular-pubescent. 

 -»- liidusium of a few broad segments, at Jirst covering the sorus completely. 



4. W. Obtiisa, Terr. (PI. 19, fig. 4, 5.) Frond broadly lanceolate, mi- 

 nutely glandular-hairy (6- 12' high), jjinnate, or nearly twice pinnate ; jjinnje 

 ratlier remote, triangular-ovate or oblong (1-2' long), bluntish, pinnately 

 parted; segments oblong, obtuse, crenately toothed, the lower pinnatifi 1 with 

 toothed lobes ; veins forked, and bearing tlie fruit-dots on or below the mi- 

 nutely toothed lobes ; indusium at length splitting into several spreading 

 jagged lobes. — Rocky banks and cliffs ; not rare. 



■*- -»- Indusium entirelij concealed beneath the sorus, divided into very narrow 

 segments or reduced to minute hairs. 



5. W. Oregana, D. C. Eaton. Smooth, with fronds (2-8' high, 8- 12" 

 ■wide) elliptical-lanceolate, pinnate, the fertile ones tallest ; pinnaj triangular- 

 oblong, obtuse, pinnatifid ; segments oblong or ovate, obtuse, finely toothed, 

 and in larger fronds incised ; fruit-dots near the margin ; indusium very small, 

 divided almost to the centre into a few necklace-like-jointed cilia. — Crevices 

 of rocks, south shore of Lake Superior (Rohblns), and westward. 



6. W. SCOpulina, D. C. Eaton. Much like the last, but the rather larger 

 fronds puberulent beneath with minute jointed hairs and stalked glands ; in- 

 dusium deeply cleft into narrow segments ending in jointed hairs. — Rocky 

 places, Minn., southward and westward. 



17. DICKS ONI A, L'lTer. (PI. 18.) 



Fruit-dots small, globular, marginal, each placed on the apex of a free vein 

 or fork ; the sporangia borne on an elevated globular receptacle, enclosed in a 

 membranaceous cup-shaped indusium which is open at the top, and on the 

 outer side partly adherent to a reflexed toothlet of the frond. (Named for 

 James Dickson, an English Cryptogamic botanist.) 



1. D. pilosiuscula, Willd. Fronds minutely glandular and hairy (2-3'^ 

 high), ovate laM<<'(>l;it(> and acuminate in outline, ])ale green, very thin, with 

 str<mg chadless stalks rising from slender extensively creeping naked root- 

 stocks, mostly bi])iniiate; primary ])inna3 lanceolate, pointed, the secondary 

 pinnatifid into obhjng and ol>tuse cut-toothed lobes ; fruit-dots minute, each on 

 a recurved toothlet, usually one at the u|iper margin of eacli l()l)e. (D. punc- 

 tilobula, Kunze.) — Common in moist and shady j'laccs, from New Eng. to 

 Minn. — Frond aweet-sceuted in drvintr. 



