108 OUR NATIVE FERNS AND THEIR AILIES. 



I. S. scolopendrium (L.) Karst. Stipes 2'— 6' long, fibril- 

 lose below ; fronds oblong-Ianceolaie from an auricled heart- 

 shaped base, entire or undulate, 7'— 18' long, i'— 2' wide, bright 

 green. (S. vulgare Smith, Asplenium scolopendrunn L.) Chit- 

 tenango Falls and Jamesville, New York; Woodstock, New 

 Brunswick {Sutlon), Owen Sound. Canada {Airs. 7?tfj) .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. Kajiitzoi, curved, and aoopoi, a heap. Includes 

 only two species. 



I. C. rhizophyllus (L.) Link. Fronds evergreen, tufted, 

 spreading 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. intermedius 

 Arthur is an interesting form, differing mainly fsom the typical 

 forms in having the base acute, without proper auricles and 

 with a single fibro-vascular bundle in the stipe. {Aniigramvia 

 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. (pnyoZ, a beech-tree, and 

 nreiiii, a fern. Includes 95 species. 



§ I. EUPHEGOPTERIS. Veins free. 



* Frottds triangular, bipimiai ifid ; pinnce sessile, adnate to a 

 winged rachis. 



I. P. phegopteris (L.) Unde. Stipes 6'— 9' long; fronds 

 longer than broad, 4' — 9' long, 4' — 6' broad, hairy on the veins 

 especially beneath ; pinnae linear-lanceolate, the lowest pair de- 

 flexed and standing forward ; segments oblong, obtuse, entire, 

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

 mari^in. {P. polypodioides Fee, Polypodiiim p/iegopteris L., P. 

 connectile Michx.) New England to Virginia and westward. 



