ODS FILICFS. (KKUNS.) 



(Ill rin>;. Fronds elongated, climbing, the luanchcs usually in pairs with a short 

 couunun fuut-stalk. 



1. L. palmatum, Swartz. Fronds slender, pinnic deeply rordatc at the 

 base, palniately 4 - 7-l()i)ed, the lobes ol)long, obtuse, entire ; the ujjper pinnuj 

 deeoin|K>und and bearing the fruit on the very narrow segments. — Low slia<ly 

 woods, Florida, and northward ; not common. — Kootstoek very slender, creep- 

 ing. Fronds 2°- 5° high, climbing on weeds and bushes. 



20. ANEIMIA, Swartz. 



Sporangia ovate, many-rayed at the apex, attached by the base in a double 

 row to tlie naiTow one-sided paniculate divisions of the two lower branches of 

 tlie frond, or on separate fronds. Indusium none. Fronds erect, commonly 

 three-branched, the middle branch sterile and 1 -3-pinnate. 



1 . A. adiantifolia, Swartz. Fronds sparingly pubescent, erect on a slen- 

 der stipe ; the two lower branches elongated, ])innately decompound, fertile ; 

 sterile part of the frond deltoid-ovate, 2-3-])innate ; ultimate segments obovate, 

 cuneate, entire or loi)ed, striate above with numerous flabellate veins. — Key 

 "West, &c., South Florida. — Fronds 6'- 12' high, rather rigid. Rootstock creep- 

 ing, slender, covered with a black tomentum. 



21. OSMUND A, L. Floweuing Fern. 



Sporangia globular, short-pedicelled, having an incomplete transverse ring, 

 represented by a few parallel stria; near the apex, opening by a vertical chink 

 into two nearly cqnal valves, paniculately arranged bn contracted jjarts of the 

 frond or on sej)ai-atc fronds. Fronds tall, erect, several from a stout rootstock, 

 1-2-pinnate. Veins forking, free. 



* Fronds bijjiimate, fertile at the top; sterile pinnoifeio. 



1- O. regalis, L. Fronds ovate, smooth; sterile pinnai distant; the finely 

 serrulate i)iiinules distinct, oblong-lanccolatc, cordate or truncate at tlie nearly 

 sessile base, sometimes auricled at the lower side of the base ; the uj)per pinna; 

 erect, panicled and thickly covered with light brown sporangia. ((). s])ectabilis, 

 Willd.) — Swamps, Florida to Mississippi, and northward. — Fronds l°-5° 

 high ; pinnules l'-2' long, 3" -4" wide. 



* * Sterile fronds pinnate : the pinncz numerous, deeply pinna! ijid, icith ohlong entire 



sefjments. 



2. O. Claytoniana, L. Fronds broadly lanceolate, woolly when young, 

 at length nearly smooth ; sterile pinnse sessile, oblong-lanceolate, deeply jiinna- 

 tifid ; the segments crowded ; fertile pinnce few, between the middle and the base 

 of the frond, contracted, the sporangia deepening in color as the sterile pinnae 

 expand. (0. interrupta, ^flrh:r.) — Low grounds in the upper districts, and 

 northward. — Fronds 2° -3° high. 



3. O. cinnamomea, L. Sterile fronds covered with rusty wool when 

 young, at length smooth ; pinnas sessile, lanceolate ; segments broadly oblong. 



