FiLiCEs. (ferns.) 667 



* Fronds hipinnaie, 

 II. A. aculeiltum, Swartz, var. Braunii, Koch. Frond spreading 

 (lJ°-2° long), oblong-lanceolate in outline, with a tapering base, the lower of 

 the many pairs of oblong-lanceolate pinnas gradually reduced in size and obtuse ; 

 pinnules ovate or oblong, obtuse, truncate and almost rectangular at the base, 

 short-stalked, or the upper confluent, sharply toothed, beset with long and soft 

 as well as chaffy hairs. (A. Braunii, 5pcnner.) — Deep woods, mountains of 

 New Hampshire, Vermont, N. New York, and northward. (Eu.) 



13. CYSTOPTERIS, Bomhardi. Bladdee-Febjt. (PI. 1 8. ) 



Fruit-dots roundish, borne on the back of a straight fork of the free veins ; 

 the delicate indusium hood-like or arched, attached by a broad base on the inner 

 side (towards the midrib) partly under the fruit-dot, early opening free at the 

 other side, which looks toward the apex of the lobe, and is somewhat jagged, 

 soon thrown back or withering away. — Tufted Ferns with slender and delicate 

 twice or thrice pinnate fronds ; the lobes cut-toothed. (Name composed of kvo-tis, 

 a bladder, and iTTCpisj/ern, from the inflated indusium.) 



1. C. bulbifera, Bernh. Frond lanceolate, elongated (l°-2° long), 

 2-pinnate; the pinnae lanceolate-oblong, pointed, horizontal (l'-2'long); the 

 rliachls and pinna; ojlen hearing bitlblets underneath, wingless; pinnules crowded, 

 oblong, obtuse, toothed or pinnatifid ; indusium short, truncate on the free side. 

 (Aspidium bulbiferum, Swartz. A. atomarium, MM.!) — Shaded ravines, 

 &c. : common. July. 



2. C. frd.gilis, Bernh. Frond oblong-lanceolate (4' -8' long, besides the 

 stalk which is fully as long), 2-3-pinnate; the pinnse and pinnules ovate or lan- 

 ceolate in outline, irregularly pinnatifid or cut-toothed, mostly acute, decurrent 

 on the margined or winged rhachis; indusium tapering or acute at the free end. — 

 Var. dentXta, Hook., is narrower and less divided, barely twice pinnate, witli 

 ovate obtuse and bluntly-toothed pinnules. (Aspidium t^nue, Swartz.) — Shaded 

 cliffs : common, and very variable. July. (Eu.) 



14. STRUTHlbPTEBIS, Willd. Ostrich-Feen. (PI. 15.) 



Fruit-dots round, on the pinnae of a separate contracted and rigid frond, the 

 margins of which are rolled backward so as to form a somewhat necklace-shaped 

 or continuous hollow body enclosing the fruit : there are 3-5 pinnate free veinlets 

 from each primary vein, each bearing a fruit-dot on its middle : fruit-dots crowded 

 and confluent ; the sporangia borne on an elevated receptacle which is half-encir- 

 eled at its base by a very delicate semicircular and ragged evanescent indusium. 

 — Sterile fronds large, very much exceeding the fertile, pinnate, the pinnoe 

 pinnatifid, all growing in a close circular tuft from thick and scaly matted 

 rootstocks. Stipes stout, angular. Pinnate veins free and simjjle. (Name 

 compounded of (rrpovdos, an ostrich, and irrepls, a fern, from the plume-like 

 arrangement of the divisions of the fertile frond.) 



1. S. Germ^ica, Willd. Sterile fronds smooth, broadly lanceolate, the 

 lowest pinnse gradually much smaller ; pinnae very numerous, narrowly lance- 

 olate, deeply pinnatifid ; the lobes oblong, obtuse : fertile frond with somewhat 



