FiLiCEs. (fkrns.) GG7 



* Fronds hipiunatc 

 11. A. acule^tum, Swartz, var. Braunii, Koch. Frond spreadimj 

 (li°-2° long), oblong-lanccolatc in outline, with a tapering Itasc, tiic lower of 

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

 ])innules ovate or oblong, obtuse, trunctitc and almost ix'ctangular at the base, 

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

 as well as chaffy hairs. (A. Urimnu, Spenner.) — Deep woods, mountains of 

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



13. CYSTOPTERIS, Bcrnhardi. Bladder-Feun. (PI. 18.) 



Truit-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 imder 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 awaj-. — Tufted Ferns with slender and delicate 

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

 a bladder, ami Trre/jt'y, /c?-n, from the inflated indusium.) 



1. C. bulbifera, Bernh. Frond Inncfolate, eJonrjattd (l°-2° long), 

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

 rhachis and pinna often bearim/ hulblcis underneath, ivinr/less ; pinnules crowded, 

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

 (Aspidium bulbifcrum, Sivai-tz. A. atomlirium. Maid.!) — Shaded ravines, 

 &c. : common. July. 



2. C. fragilis, Bernh. Frond ohlong-lanceolatc (4' -8' long, besides the 

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

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

 on (he margined or winged rliachis ; indusium tapering or acute at the free end. — 

 Var. dent.Vta, Hook., is narrower and less divided, barely twice pinnate, with 

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

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



14. STRUTHIOPTERIS, Willd. Ostkich-Fekn. (PL 1.5.) 



Fruit-dots round, on the pinnns 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 arc 3-5 pinnate free veinlcts 

 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- 

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

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

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

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

 compounded of arpovdik, an ostrich, and UTepli, a Jem, from the plume-like 

 arrangement of the divisions of the fertile frond.) 



1. S. Germanica, Willd. Sterile fronds smooth, broadly lanceolate, the 

 lowest pinnas gradually much smaller; pin niu very numerous, narrowly lance- 

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



