G34 FiLicES. (ferns.) 



niinatp, pimiatifid, 3'-4' long, the segments entire; veins sinjple. (Poly- 

 ]Mt(linni, L.) — Kocky woods, Kast Florida {Miss RcyiwUls). 



4. P. reptans, I). C. Eaton. Fronds si)rea<ling or i>rocinnl)ent, often 

 rooting at tlie apex, l°-2^1(jng; ])inn;v A'-l' long, oljlong, olituse, crenate, 

 truncate at the base, short-petioled, the lower distant ; veins lirancliing. (Poly- 

 podiuni, Sicartz.) — lleruaudo County, Flurida (./. Jj. ^mll/i). 



19. ONOCLEA, L. 



Fertile fronds contracted, tlie pinnules strongly revoiute ami berry-like ; 

 fruit-dots ou the back of the free veins, with an elevateil receptacle ; iudusiuni 

 attached partly to the receptacle and partly to the intervenular surface. 

 Sterile fronds foliaceous, much taller than the fertile ones. 



1. O. sensibilis, L. Sterile fronds ou a long smooth stipe, broadly 

 deltoid-ovate, pinuatilid almost or quite to tlie racliis ; the divisions lanceo- 

 late, entire or creuately incised ; veins finely reticulated with obloug-hex- 

 agonal areoles ; fertile fronds .shorter, bipinnate ; piuiuu erect, appres.sed to 

 therachis; the pinnules crowded. — Meadows and wet places. — Kootstock 

 nearly uaked, creeping. Fronds varying from four inches to three feet iu 

 height. 



20. WOODSIA, R. Br. 



Fruit-dots on the back of the veins ; the involucres placed beneath the 

 fruit-dot, saucer-shaped or cup-shaped, divided into irregular lobes or a deli- 

 cate fringe, or sub-globose and contracted at the mouth. Small Ferns with 

 many fronds from a short scaly rootstock. 



* Involucre fringed, the hair-like divisions incurved on the sporangia. 



1. W. Ilvensis, R.Br. Fronds sparingly hairy above, villous beneath 

 and on the stipe and rachis with brown hairs and narrow chaff, lanceolate, 

 pinnate ; piunie ovate-oblong, deeply pinnatifid, the divisions oblong, obtuse, 

 entire or crenate. Fruit-dots enveloped iu the fringe of the involucre. — 

 Rocks along the Alleghany Mountains. — Fronds 3'- 8' high. 



* * Involucre divided into a few irregular lobes. 



2. "W. obtusa, Torr. Fronds nearly smooth, broadly lanceolate, pinnate, 

 or near the rachis bipinnate ; pinna? triangular-ovate, the lower ones distant, 

 pinnately parted ; segments oblong, obtuse, the upper ones toothed, the lower 

 ones pinnatifid with toothed lol)es ; veins forked, the tips whitish on the upper 

 surface of the frond ; fruit-dots on the lobules ; involucrt; delicate, the lobes 

 hidden by the ripened sporangia. — Rocky places, Georgia, and northward. 

 — Fronds 6' -16' high. 



21. DICKSONIA, L'ller. § SITOLOBIUM, Desv. 



Fruit-dots small, globular, terminal on the free veins ; sporangia on an ele- 

 vated receptacle in a thin cup-shaped involucre which is ])artly adherent to a 

 reflexed lobule of the frond. Fronds large, 2-3-pinnate, from a creeping 

 rootstock. — DiCKSOXiA jiroper has large two-lipped involucre?, of a firmer 

 texture, and several species have an arborescent. caudex. 



