FILICES. (FERNS.) 663 



10. CAMPTOSORUS, Link. WALKING-LEAF. (PL 17.) 



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 Ka/iTrrds, bent, and tra>pos, for fruit-dot.) 



1. C. rhizoph^llus, Link. (Asplenium rhizophyllum, L. Antigram- 

 ma, J. Smith, Torr. Also C. rumicifolius, Link.) Shaded calcareous rocks, 

 W. New England to Wisconsin, and southward : rare or local. July. Fronds 

 evergreen, growing in tufts, spreading or procumbent (4'-9' long), lanceolate 

 from an auricled-heart-shaped or often hastate base, tapering above into a slender 

 prolongation like a runner, which often roots at the apex and gives rise to new 

 fronds, and these in turn to others ; hence the popular name. A singular form 

 is found at Mount Joy, Penn., by Mr. Stauffer, having roundish fruit-dots and 

 inconspicuous veins. 



11. PHEGOPTEBIS, Fee.' (Sp. of POLTPODITJM, L.) 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 ^yoy, an oak or beech, and irre pis, fern.) 



* Fronds twice pinnatifid: pinnce all sessile, adnate to the winged rhachis. 



1. P. polypodioides, Fee. Fronds triangular, longer than broad (4/-9' 

 long), hairy on the veins, especially beneath; pinnae linear-lanceolate, the lowest 

 pair deflexed and standing forwards ; their divisions oblong, obtuse, entire, the 

 basal ones decurrent and adnate to the main rhachis ; fruit-dots all near the 

 margin. (Ph. vulgaris, Mettenius. Polypodium Phegopteris, L., and former 

 ed. P. connectile, Michx.) Damp woods: common northward. July. 

 Rootstock slender, creeping, bearing a few distant slender stalks, rather longer 

 than the fronds. (Eu.) 



2. P. hexagon6ptera, Fee. Fronds triangular, usually broader than long 

 (7'- 12' broad), slightly pubescent and often finely glandular beneath; pinnae 

 lanceolate ; upper segments oblong, obtuse, toothed or entire, those of the very 

 large lowest pinnae, elongated and pinnately lobed, basal ones very much "decurrent 

 and forming a continuous many-angled wing along the main rhachis ; fruit-dots 

 near the margin ; some also between the sinus and the midrib. (Polypodium 

 hexagonopterum, Michx.) Rather open woods : common, especially southward. 

 July. Larger and broader than the last, which it often closely resembles. 



* * Fronds ternate, the three divisions petioled : rhachis wingless. 



3. P. Dryopteris, Fee. Fronds smooth, broadly triangular (4' -6' wide); 

 the 3 triangular primary divisions widely spreading, 1 -2-pinnate; segments ob- 

 long, obtuse, entire or toothed ; fruit-dots near the margin. (Polypodium Dry- 

 opteris, L.) Rocky woods : common northward. July. (Eu.) (P. CALCAREA, 

 which is more rigid, and minutely glandular-mealy, especially on the rhachis 

 and midrib, is to be sought for northward.) 



