030 OlMlIOIiLOSSACEyE. (AnniCU's TONGUE FAMILY.) 



1. A. adiantifolia, Swartz. Fronds si)ariiigly puliesceiit, ereit on a 

 slender stii)e; ilio two lower brandies eloiiji^aled, pinnately deconi|jonnd, fer- 

 tile; sterile part of the frond deltoid-ovale, 2-3-])inuate ; ultimate segments 

 obovate, cuneate, entire or lobed, striate above with numerous flabellate veins. 



— Key West, etc., South Florida. — Fronds 6' - 12' high, rather rigid. Hoot- 

 stock creeping, slender, co\ero(i with a black tomeiitiim. 



25. OSMUNDA, L. Flowering Fekx. 



Sporangia globular, slinrt-jicilirclled, having an inconi])lete transverse ring, 

 rej)rc.scnted by a few parallel stria; near the upex,o])euing by a vertical chink 

 into two nearly equal valves, paniciilately arranged on contracted jiarts of the 

 frond or on separate fronds. Fronds tall, erect, several from a stout root- 

 stock, 1 - 2-piuuate. Veins forking, free. 



* Fronds bipinnate, fertile at the top: sterile pimiw/ew. 

 I • O. regalis, L. F^ronds ovate, smooth ; sterile pinna; distant ; the finely 

 serrulate pinmile.s distinct, oblong-lanceolate, cordate or truncate at the nearly 

 sessile l)ase, sometimes auricled at the lower side of the base; the upper ])innse 

 erect, jjanicled and thickly covered with light brown sporangia. — .Swamps, 

 Florida, and northward. — Fronds l°-3°higii; pinnules T- 2' long, 3" -4" 

 wide. 



* * Sterile frunds pinnate: the ])inn(v numerous, deeplij pinnatijid, with oblony 

 entire ser/ments. 



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

 at length nearly smooth ; sterile pinna; sessile, oblong-lanceolate, deeply pin- 

 natifid ; the segments crowded ; fertile pinnae few, between the middle and the 

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

 pinnae expand. (0. iuterrupta, Michx.) — 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 lengtli sniootli ; pinuffi sessile, lanceolate ; segments broadly oblong, 

 obtuse ; the lower basal ones in large fronds often elongated and pinnatifid ; 

 fertile frond distinct, contracted, bi])innate, very woolly, densely covered with 

 cinnamon-colored sporangia, withering before the sterile fronds are expanded. 



— Low grounds, common. — Fronds l°-3° liigh- 



Order 165. OPHIOGLOSSACE^. (Adder's Tongue 

 Family.) 



Sporangia very large, sessile, spiked or panicled, coriaceous, not 

 reticulated, on narrow divisions of the frond, destitute of a ring, 

 transversely two-valved. Fronds not circinate in vernation. 



Synopsis. 



1. BOTRYCHIUM. Sporangia in panicled spikes. Sterile part of the frond plnnately 



divided. 



2, OPHIOGLOSSUM. Sporangia in a sunple spike. Sterile part of the frond simple (except 



No. 4). 



