588 FILIOKS. (FEKNS.) 



1. ACROSTICHUM, L. 



Sporanfria entirely covering the lower surface of the upper pinna;. Veins 

 finely reticulated with oblong Iiexagonal meshes. — Tall Fenis, with pinnate 

 fronds. 



1. A. aureum, L. Fronds coriaceous; pinna; short-stalked, lanceolate- 

 oblong, entire. — Coast of South Florida. — Fronds 4° - 8° high, dark green, 

 shining. 



2. POLYPODIUM, L. Polypody. 



Fruit-dots round, naked, mostly at the ends of the free or reticulated veins. — 

 Rootstocks creeping. Sterile and fertile fronds alike. 



§ 1. POLYPODIUM Pkoi'kr. - F«ns/ree. 



1. P. VUlgare, I>. Fronds evergreen, smooth on both sides, oblong, 

 simply and deeply pinnatifid ; the divisions lincar-oblong, obtuse, slightly 

 toothed ; fruit-dots large. — Mossy rocks, &c., in shady woods, in the upper 

 districts of Alabama, and northward. — Fronds 4'- 10' high. 



2. P. Plumula, "Willd. Fronds linear-lanceolate, narrowed at both ends, 

 pinnatifid to the black and somewliat chaffy midrib ; the divisions very numer- 

 ous, narrowly linear, entire, wider -at the base ; fiuit-dots small. — Tampa Bay, 

 Dr. Lenvc:mrorih. — Yxon(^% 12' -18' high, 18"- 24" wide. 



3. P. hexagonopterum, Mi Ijx. Fronds annual, broadly triangular, 

 bipinnatifid ; pinna; lanceolate, acuminate, spreading, the lower pair erect; pin- 

 nules oblong, mostly obtuse, crenately toothed or entire ; fruit-dots numerous, 

 minute. — Shady woods, Florida to Mississippi, westward and northward — 

 A foot or mnn- higli from an elongated cre(>ping rooistock. Pinna; decurrcnt, 

 forming irregular hexagonal wings on the rachis. 



§ 2. MARGINATvIA, Bory. — Vnns obscure, S07nei!mes rrticnht'ntg near the 

 margin. Stipe and lower surface of the frond cocered with chaff)/ .icales. 



4. P. inoanum, Swartz. Fionds evergreen, coriaceous, beneath thickly 

 beset with peltate chaffy scales, smooth and green above, pinnately jiarted; the 

 divisions oblong, obtuse, entire ; fruit-dots near the margin. — On trunks of ti-ces, 

 Florida to Mississippi, westward and northward. — Rootstock chaffy, creeping. 

 Fronds 3' - 8' high. 



§ 3. CAMPYLONEURUM, Presl.— Fw(.9 parallel, pinnate from the midrib: 

 veinlets reticulated, forming a sn-ies of parallel angular u/cs tv/th short vcinlils pro- 

 ceeding from their angles. Fromh ximplc. 

 .5. P. Phyllitidis, L. Fronds linear-lanc(>()latc, entire, acuminate, of ft 



thin chartaccous texture, scnii-pcliucid ; fruit-dots rather large, in two rows 



between the veins. — South Florida. — Fronds 1° -2° high. 



^ 4. PIILEBODIUM, R. lii: — Veins pinnarefo'u the midrib, firmte: reinl>ts 

 rej'cnialid in moslli/ elongated meshes. Fruit-dots large, commoniij at the extremities 

 oftico converging veinlets. 

 6. P. aureum, L. Froiid.i smooth and glaucous, broadly ovale, pinnately 



