10. SCOLOPÉNDRIUM, Smith. Hart's-Tongue. ([Pl. 18.])
Fruit-dots linear, elongated, almost at right angles to the midrib, contiguous by twos, one on the upper side of one veinlet, and the next on the lower side of the next superior veinlet, thus appearing to have a double indusium opening along the middle. (The ancient Greek name, so called because the numerous parallel lines of fruit resemble the feet of the centipede, or Scolopendra.)
1. S. vulgàre, Smith. Frond oblong-lanceolate from an auricled-heart-shaped base, entire or wavy-margined (7–18´ long, 1–2´ wide), bright green.—Shaded ravines and under limestone cliffs; central N. Y.; also in Canada and Tenn.; very rare. Aug. (Eu.)
11. CAMPTOSÒRUS, Link. Walking-Leaf. ([Pl. 18.])
Fruit-dots oblong or linear, as in Asplenium, but irregularly scattered on either side of the reticulated veins of the simple frond, those next the midrib single, the outer ones inclined to approximate in pairs (so that their two indusia open face to face), or to become confluent at their ends, thus forming crooked lines (whence the name, from καμπτός, bent, and σωρός, for fruit-dot.)
1. C. rhizophýllus, Link. Fronds evergreen, sub-coriaceous, growing in tufts, spreading or procumbent (4–12´ long), gradually narrowed from a cordate or auricled base to a long and slender acumination, which often roots at the end and forms a new plant.—Shaded rocks, especially calcareous rocks, N. Eng. to Minn., and southward to Kan. and Ala.—The auricles are sometimes greatly elongated, and even rooting; in another form they are lacking, as in the thinner leaved C. Sibiricus. July.
12. PHEGÓPTERIS, Fée. Beech Fern.
Fruit-dots small, round, naked (no indusium), borne on the back of the veins below the apex. Stipe continuous with the rootstock.—Our species have free veins and bright green membranaceous fronds, decaying in early autumn. (Name composed of φηγός, an oak or beech, and πτερίς, fern.)
[*] Fronds twice pinnatifid; pinnæ all sessile, adnate to the winged rhachis.
1. P. polypodioìdes, Fée. Fronds triangular, longer than broad (4–9´ long), hairy on the veins, especially beneath; pinnæ linear-lanceolate, the lowest pair deflexed and standing forward; their divisions oblong, obtuse, entire, the basal decurrent upon the main rhachis; fruit-dots all near the margin.—Damp woods; common northward. July.—Rootstock slender, creeping, bearing a few distant slender stalks, rather longer than the fronds. (Eu.)