14 POLYPODIACEAE 
15. Asplenium acrostichoides Sw. Rootstock sinuous. Petioles 2-3 dm. long, 
straw-colored, somewhat chaffy below at least when young; leaf-blades lanceolate in out- 
line, 3-9 dm. long, acute or acuminate at the apex, narrowed to the base, pinnate-pinnatifid ; 
leaflets linear-lanceolate, sessile, acuminate, deeply pinnatifid into numerous oblong obtuse 
or subacute, slightly crenate segments: sori crowded, slightly curved, or straight, the lower 
ones often double : indusium light-colored and somewhat shining when young. 
In rich moist woods, Nova Scotia to Minnesota, south to Georgia and Louisiana. Also in Asia. 
16. Asplenium Filix-foémina (L.) Bernh. Rootstock rather slender for the size of 
the plant. Petioles tufted, 0.5-2.5 dm. long, straw-colored, brownish or reddish ; leaf- 
blades broadly oblong-ovate or oblong-lanceolate, acuminate at the apex, 3-9 dm. long, 2- 
pinnate ; leaflets lanceolate, acuminate, short-stalked or the upper ones sessile 1-2 dm. 
long, the ultimate divisions oblong-lanceolate, incised or serrate, their lobes or teeth often 
again toothed, those toward the ends of the leaflets confluent by a very narrow margin to 
the secondary rachis : sori short, the indusia straight or variously curved, sometimes horse- 
shoe-shaped. 
In wet woods and thickets, Nova Scotia to Alaska, south to Florida, Louisiana and Arizona. Also 
in Europe and Asia. Very variable. 
17. PHYLLITIS Ludwig. 
Large ferns with oblong or strap-shaped mostly entire leaf-blades. Sori linear, elon- 
gated, almost at right angles to the midrib and contiguous in pairs, one on the upper side 
of a veinlet, the other on the lower side of the next contiguous veinlet, thus appearing to 
have a double indusium opening longitudinally along its middle. [Scolopendrium Adans. } 
1. Phyllitis Scolopéndrium (L.) Newman. Rootstocks short, chaffy with light 
brown scales. _ Petioles 5-15 em. long, fibrillose-chaffy below or sometimes up to the top ; 
leaf-blades entire, bright green, firm, 2-4.5 dm. long, cordate at the base, pairs of sori dis- 
tinct, 4-15 mm. long, conspicuous: veins free, usually once forked near the midrib. 
[Scolopendrium vulgare J. E. Smith. ] 
i On shaded limestone cliffs, New Brunswick to Ontario and New York, south to Tennessee. Also 
in Europe, Asia and Africa. Hart’s TONGUE. 
, 18. CAMPTOSORUS Link. 
Slender plants, with tapering simple entire or undulate leaf-blades. Sori linear or ob- 
long, several times longer than broad, irregularly scattered on either side of the reticulate 
veins or sometimes crossing them, partly parallel to the midrib and partly oblique to it, the 
outer ones more or less approximate in pairs. Indusium membranous. 
1. Camptosorus rhizophyllus (L.) Link. Rootstock short, chaffy. Petioles light 
green, 2.5-15 em. long, tufted, spreading ; leaf-blades rather thin, lanceolate, simple, long- 
acuminate at the apex, cordate, hastate or rarely narrowed at the base, 10-25 cm. long, 
sometimes with a more or less elongated pair of basalauricles; tip of the leaf and sometimes 
the tip of one or both of the basal auricles rooting and forming a new plant by the ultimate 
withering away of its tissue : sori usually numerous, irregularly scattered. 
On roeks, preferring limestone, Quebec to Ontario an i 
P sete peat wee Q and Minnesota, south to Georgia and Kansas. 
19. LORINSERIA Presl. 
Rather coarse ferns of swamps, with dimorphous leaves and rather large linear sori 
sunk in cavities in the leaf and arranged in chain-like rows. Indusia rather leathery, fixed 
by their outer margins and covering the cavity like a lid. Veins forming copious areolae. 
1. Lorinseria areolàta (L.) Presl. Rootstock slender, chaffy. Leaves of two kinds, 
the fertile taller than the sterile and their blades borne on longer petioles, 3-6 dm. high 
their segments much contracted, narrowly linear, 7-12.5 em. long, 4-6 mm. wide distant, 
their bases connected by a very narrow wing along the rachis or quite distinct ; sterile leaf- 
blades deltoid-ovate, membranous, broadest at the base, or sometimes with one or two small 
segments below, acuminate, the segments lanceolate or oblon -lanceolate, minutely serru- 
late, sometimes undulate, their bases connected by a rathe is-wl 
. L L * r y d e 
wardia angustifolia J. E. Smith. ] e Pian 
In swamps or wet woods, Maine and Michigan to Florida, Louisiana and Arkansas. 
20. ONOCLEA L. 
Ferns with elongated horizontal rootstocks. Leaves growing separately. Fertile leaf- 
blades closely rolled up into berry-like segments, and entirely unlike the broad pinnatifid 
