( FEKNS . ) 6 9 1 



2. W. hyperb6rea, R. Brown. Frond narrowly oblong-lanceolate (2- 

 6' long by 8-12" wide), smooth above, sparingly paleaceous-hirsute beneath, 

 pinnate ; the pinnae triangular-ovate, obtuse, pinnately lobed, the lobes few 

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

 Vt. and N. Y., and northward ; rare. (Eu.) 



3. W. glab&la, R. Brown. (PI. 19, fig. 1-3.) Smooth and naked 

 throughout; frond linear and very delicate (2-5' high), pinnate; pinnce round- 

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

 fruit-dots scanty ; the hairs of the indusium fewer than in the last two species. 

 On moist mossy rocks, mountains of northern New Eng., north and west- 

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



# * Stalks not articulated ; fronds never chaffy, often glandular-pubescent. 

 <- Indusium of a few broad segments, at first covering the sorus completely. 



4. W. Obtfcsa, Torr. (PI. 19, fig. 4, 5.) Frond broadly lanceolate, mi- 

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

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

 parted ; segments oblong, obtuse, crenately toothed, the lower pinnatifid with 

 toothed lobes ; veins forked, and bearing the 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 entirely concealed beneath the sorus, divided into very narrow 

 segments or reduced to minute hairs. 



5. W. Oreg&na, L>. C.Eaton. Smooth, with fronds (2 -8' high, 8- 12" 

 wide) elliptical-lanceolate, pinnate, the fertile ones tallest ; pinnae 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 (Robbins), 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'Her. (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. pilosiliscula, Willd. Fronds minutely glandular and hairy (2-3 

 high), ovate-lanceolate and acuminate in outline, pale green, very thin, with 

 strong chaffless stalks rising from slender extensively creeping naked root- 

 stocks, mostly bipinnate ; primary pinnae lanceolate, pointed, the secondary 

 pinnatifid into oblong and obtuse cut-toothed lobes ; fruit-dots minute, each on 

 a recurved toothlet, usually one at the upper margin of each lobe. (D. punc- 

 tilobula, Kunze.) Common in moist and shady places, from New Eng. to 

 Minn. Frond sweet-scented in drying. 



