4 OPHIOGLOSSACEAE. 



the backs of Bimply forked free veins; indusium attached under 

 the fruit dot, n.und or star-shaped, delicate, early withering. 



lablOUS or nearly so; lobes of the indusium hair-like. W. oregana. 

 iacid-puberulent; lobes of the indusium broader at base. W. scopuhna. 



Woodsia oregana I). C. Eaton. Rootstock short; petioles glabrous, not 

 jointed, brownish below; blades glabrous or slightly roughened, 5-28 cm. long, 

 elliptic-lanceolate, the sterile shorter than the fertile; pinnae tnangular- 

 oblong, obtuse, pinnatifid; lower pinnae reduced in size and somewhat remote 



;i the others; rachis straw-colored; segments oblong or ovate, dentate or 



nate, the teeth often reflexed and covering the fruit dots; indusium deeply 

 cleft into hair-like segments. Common in crevices in rocks usually in shady 

 plai ■ 



Woodsia scopulina D. C. Eaton. Similar to W. oregana but the leaves 

 puberulenl with minute white jointed hairs and with stalked glands; indusium 

 deeply divided into segments that are broader at the bases. In rock crevices 

 near Spokane and about Lake Coeur d'Alene, Idaho. 



8. FILIX. 



Delicate rock-ferns; leaves 2-3-pinnate or pinnatifid; leaf- 

 Btalks slender; fruit-dots round, borne on the backs of the veins; 

 indusium attached by a broad base on the inner side partly under 

 the fruit dot, early opening and withering away. 



Filix fragilis (L.) Underw. Bladder Fern. Rootstock short; petioles 10- 

 20 cm. long; blades thin, oblong-lanceolate, only slightly tapering below, 10-25 

 cm. long, 3-7 cm. wide, 2-3-pinnatifid or pinnate; pinnae lanceolate-ovate, 

 irregularly pinnatifid with bluntly or sharply-toothed segments along the mar- 

 gined or winged rachis; texture membranous. In shady woods, mostly on 

 rock-. 



Family 2. OPHIOGLOSSACEAE. 



Plant consisting of an underground stem bearing one or more 

 leaves which rise above ground and are divided usually into two 

 parts, .i fertile portion and a sterile portion, the latter being the 

 foliage part of the leaf; frequently the fertile portion lacking in 

 sonu- of the loaves; sporangia borne within the tissue of the fertile 

 portion, ringless, opening by a transverse slit. 



9. BOTRYCHIUM. Grape Fern. 



tock very short, with clustered fleshy roots; sterile part 

 ill- leaf ternately or pinnately divided or compound; veins 

 fertile Begment 1-3-pinnate, each pinnule bearing a double 

 sile sporangia; spores numerous, sulphur-yellow. 



Botrychium silaifolium Preal. Stout, rather fleshy, 10-35 cm. high; stem 



and stout, swollen with the contained bud of the succeeding season; 



or two, their petioles stout, 2-12 cm. long; sterile blades 8-20 cm. 



long, ternate, the primary divisions tripinnate or quadri- 



ifid; ultimate Begments obliquely ovate, 1-1.5 cm. long, thick, entire 



- wavy, theveuu Few, obscure; sporophyll erect, the petiole stout, the fruiting 



