FILICES. lOI 



chises often pubescent. Huachuca Mountains, South Arizona 

 i^Lcininon, Texas {^Ncalley). 



XII. CERATOPTERIS Brong. Floating-fern. 



Sori placed on two or three veins which run down the frond 

 longitudinally, nearly parallel with both the edge and midrib. 

 Sporangia scattered on the receptacles, sessile, sub-globose, 

 with a complete, partial, or obsolete ring. Indusia formed of 

 the reflexed margins of the frond, those of opposite sides meet- 

 ing at the midrib. Name from Gr. Kepai, horn, and nrepii, a 

 fern. Contains a single tropical species. 



I. C. thalictroides (L.) Brong. Stipes tufted, inflated, 

 filled with large air cells; fronds succulent in texture, the sterile 

 ones floating in quiet water, simple or slightly divided when 

 young, bi^tripinnate when mature; fertile ones bi — tripinnate; 

 ultimate segments pod like. Southern Florida. 



XIII. LOMARIA Willd. 



Sori in a continuous band next the midrib of the contracted 

 pinnae of the fertile frond, covered till mature by an elongate 

 indusium, either formed of the recurved and altered margin of 

 the pinna or sub-marginal and parallel to the margin. Veins of 

 sterile frond oblique to the midrib, simple or forked and free. 

 Fronds mostly elongate, of two kinds, the sterile foliaceous, 

 the fertile commonly much contracted. Name from Gr. Xofxa, a 

 fringe. Principally south temperate, containing 45 species. 



§ EULOMARIA. 



I. L. spicant (L.) Desv. (Deer-fern.) Rootstock short 

 very chaffy ; fronds tufted, erect, sterile ones nearly sessile, 

 narrowly linear-lanceolate, 8' — 24' long, i' — 3' wide, tapering to 

 both ends, cut to the rachis into oblong or oblong-linear closely 

 set segments, the lower ones gradually diminishing to minute 

 auricles; fertile fronds sometimes three feet high, long-stalked, 

 pinnate; pinnae somewhat fewer and more distant, longer and 

 much narrower than in the sterile frond; indusia distinctly in- 

 tramarginal. (Os/nimda spicant L., Blechnum boreale Swz.) 

 California, Oregon, and northward. 



