FILICES. (FERNS.) 589 
parted; the divisions lanceolate, acuminate, entire; fruit-dots mostly in a double 
series in each lobe of the frond, near the midrib. — South Florida. — Rootstock 
large, creeping, copiously beset with lanceolate brown chaffy scales. Stipe 
smooth, 8/-10’ long. Fronds 10' — 15' long, two thirds as wide. j 
3. VITTARIA, Smith. 
Sporangia on a continuous receptacle immersed in a furrow open outwardly 
at or near the margin of the frond. Veins obscure, simple, connected at their 
extremities by the receptacle. Fronds simple, linear, elongated. 
1. V. lineata, Swartz. Fronds nearly sessile, narrowly linear, elongated ; 
. midrib inconspicuous, lines of fructification near the margin. (V. angustifrons, 
- Michx,) — On trees, South Florida. Fronds many from the short scaly root- 
stock, 19 — 2° long. 
4. PTERIS, L. 
EERE borne on a transverse marginal receptacle connecting the ends of 
the veins. Indusium continuous, formed of the membranaceous margin of the 
frond, at first reflexed, at length pushed back and disclosing the ripened fructifi- 
cation. Fronds 1 -3-pinnate or decompound. 
1. P. longifolia, L. Fronds lane hate; pinnæ numerous, nar- 
rowly linear, acuminate, obtuse at the base, the terminal one elongated, the 
lower ones gradually smaller. — Key West. — Fronds 19-29 high, smooth. 
Stipe more or less chaffy. 
2. P. Cretica, L. Fronds snob. ovate, ternate or pinente; ihe lower 
pinnæ 2 -3-parted, sessile, the upper ones decurrent ; sterile ones lanceolate, 
or linear-lanceolate, finely serrate ; fertile ones narrower, entire, or spinulose- 
serrate at the acuminate apex ; veins straight, simple or forked, close together, 
almost at right angles to the midrib. — Shady woods, Middle and East Florida, 
— Frond 6'- 10’ long. Stipe smooth, very long and slender. 
3. P. aquilina, L. (Braxe.) Fronds large, glabrous or somewhat hairy 
beneath, broadly triangular, tripinnate; pinnules oblong or linear, entire or has- 
tate or pinnately parted ; ultimate segments obtuse, oblong or linear, the termi- 
nal ones often elongated, the margin reflexed or revolute ; veins simple or forked ; 
indusium narrow, ciliated. — Common everywhere. — Stipe stout, 6/- 2° high. 
Frond 19-2? long. 
Var. eaudata (P. caudata, L.), with very narrow segments, fhe terminal 
ones elongated, and both surfaces of the frond glabrous or even glaucous, occurs 
in South Florida and along the Gulf coast. — : 
. PELLZEA, Link. 
 Fruitdots oblong or linear at the ends of the veins, confluent in a broad 
marginal line of fructifieation. Indusium as in Pteris. Veins free, forked or 
annee, Fronds mostly 1- 3-pinnate, smooth, mostly coriaceous. S E o 
Link. Fronds tufted, coriaceous, ovate-lanceolate, 
pinn: opposite, t 
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