588 FILICES.  (FERNS.) 
1 ACROSTICHUM, L. 
Sporangia entirely covering the lower surface of the upper pinne. Veins 
finely reticulated with oblong hexagonal meshes. — Tall he: with pinnate 
fronds. 
l. A. aureum, L. Fronds coriaceous; pinnze short-stalked, lanceolate- 
oblong, entire. — Coast of South Florida. — Fronds 49 - 8° high, dark green, 
shining. 
2. POLYPODIUM, L. Porxropx. 
Fruit-dots round, naked, mostly at the ends of the free or reticulated veins. — 
Rootstocks creeping. Sterile and fertile fronds alike. 
§ 1. POLYPODIUM Proper. — Veins free. ° 
1. P. vulgare, L. Fronds evergreen, smooth on both sides, oblong, 
simply and deeply pinnatifid; the divisions linear-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 somewhat chaffy midrib; the divisions. very numer- 
ous, narrowly linear, entire, wider at the base; fruit-dots small. — Tampa Bay, 
Dr. Leavenworth. — Fronds 12! — 18! high, 18'! — 24" wide. 
3. P. hexagonopterum, Michx.  Fronds annual, broadly triangular, 
bipinnatifid; pinnz 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 more high from an elongated creeping rootstock. Pinne am 
forming irregular hexagonal wings on the rachis. 
$ 2. MARGINARIA, Bory. —Veins obscure, sometimes reticulating near the 
» margin. Stipe and lower surface of the frond covered with chaffy scales. 
4. FP. incanum, SwWartz. Fronds evergreen, coriaceous, beneath thickly 
beset with peltate chaffy scales, smooth and green above, pinnately parted; the 
divisions oblong, obtuse, entire ; fruit-dots near the margin, — On trunks of trees, 
Florida to Mississippi, weetward and northward. — Rootstock chaffy, creeping: 
Fronds 3' - 8 high. 
$3. CAMPYLONEURUM, Presl. — Veins parallel, pinnate from the midrib : 
veinlets reticulated, forming a series of parallel angular arcs with short MM. 
itding from their angles. Fronds simple. 
ES cd Phyllitidis, L. Fronds linear-lanceolate, entire, acuminate, of ur 
thin chartaceous texture, semi-pellucid; fruit-dots rather large, in two TOW? 
between the veins, — South Florida. — Fronds 1° - 2° high. 
mero . R. Br. — Veins pinnate from the midrib, furcate: veinlets 
Eee red 
