108 OUR NATIVE FERNS AND THEIR ALLIES. 



i. S. vulgare Sm. Stipes 2' 6' long, fibrillose below; 

 fronds oblong-lanceolate from an auricled heart-shaped base, 

 entire or undulate, 7' 18' long, i' 2' wide, bright green. (S. 

 officinarum Swz., Asplenium scolopendrium L.) Chittenango 

 Falls and Jamesvi lie, New York; Woodstock, New Brunswick 

 (Sutton), Owen Sound, Canada (Mrs. Roy), Tennessee. 



XVIII. CAMPTOSORUS Link. WALKING LEAF. 



Sori oblong or linear, irregularly scattered on either side of 

 the reticulate veins of the simple frond, those next the midrib 

 single, the outer ones inclined to approximate in pairs, or to 

 become confluent at their ends, thus forming cropked lines. 

 Name from Gr. xajurcroS, curved, and croapd?, a heap. Includes 

 only two species. 



i. C. rhizophyllus Link. Fronds evergreen, tufted, spread- 

 ing or procumbent, 4' 9' long, lanceolate from an auricled, 

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

 prolongation which often roots at the apex. Var. interniedius 

 Arthur is an interesting form, differing mainly from the typical 

 forms in having the base acute, without proper auricles and 

 with a single fibro-vascular bundle in the stipe. (Antigramma 

 rhizophylla J. Sm., Scolopendrium rhizophyllum Hook., Asple- 

 nium rhizophyllum L.) New England to Wisconsin and south- 

 ward ; the variety in Iowa. 



XIX. PHEGOPTERIS Fee. BEECH-FERN. 

 Sori small, round, naked, borne on the back of the veins 

 below the apex. Stipe continuous with the rootstock. Veins 

 free or reticulate. Name from Gr. <t>vyo$, a beech-tree, and 

 itrepiS, a fern. Includes 95 species. 



i. EUPHEGOPTERIS. Veins free. 



* Fronds triangular, bipinnatifid; pinna sessile, adnate to a 

 winged rachis. 



i. P. polypodioides Fee. Stipes6' 9' long; fronds longer 

 than broad, 4' 9' long, 4' 6' broad, hairy on the veins especi- 

 ally beneat'j ; pinnae linear-lanceolate, the lowest pair deflexed 

 and standing forward , segments oblong, obtuse, entire, the 

 basal ones decurrent and adnate to the main rachis ; sori near 

 the margin. (P. mdgaris Mett., Polypodium phegopteris L. , P. 

 connect He Michx.) New England to Virginia and westward. 



