GENUS 9. 



FERN FAMILY 



i. Lorinseria areolata (L.) Presl. 

 Net-veined Chain-fern. Fig. 55. 



Acrostichum areolatum L. Sp. PI. 1069. 1753- 

 Woodwardia angustifolia J. E. Smith, Mem. 



Acad. Turin 5: 411. 1793- 



Lorinseria areolata Presl. Epim. Bot. 72. 1851. 

 IVoodn'ardia areolata Moore, Ind. Fil. xlv. 1857. 



Rootstock slender, widely creeping, chaffy, 

 with scattered leaves. Fertile leaves erect, 

 surpassing the sterile; stipes i-2 long, stout, 

 puplish-brown, lustrous; blades 6'-i2' long, 

 ovate-oblong; pinnae linear, distant, usually 

 connected by a slight wing. Sterile leaves 

 spreading; stipes 6'-i4' long, slender, green- 

 ish ; blades 6'-is' long, ovate-oblong to deltoid- 

 ovate, acuminate, membranous, deeply pinna- 

 tifid; pinnae linear-lanceolate to oblong-lan- 

 ceolate, acute, lightly or sometimes deeply 

 sinuate, serrulate, usually connected by a var- 

 iable wing, or the lower pairs free; veins 

 joined in numerous hexagonal areoles. 



In swamps and moist soil, Maine to Florida, 

 Tennessee, Louisiana, and Arkansas ; also in 

 Michigan. Aug.-Oct. Called also Netted chain- 

 fern. Various imperfectly fertile forms occur. 



10. PHYLLITIS Ludwig, Inst. Hist. Phys. Reg.-Veg., ed. 2, 142. 1757. 

 [SCOLOPENDRIUM Adans. Fam. PI. 2: 20. 1/63.] 



Small or medium-sized ferns with deltoid, oblong or strap-shaped mostly entire leaves, 

 and linear elongate sori 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 of the 

 group above, the closely adjacent sori each with a narrow laterally attached indusium meeting 

 that of the other, the double sorus thus appearing to have a common indusium opening longi- 

 tudinally along its middle. [Greek name of fern.] 



About 5 species, mainly of temperate regions, only the following known in North America. 

 Type species : Asplenium Scolopendrium L. 



i. Phyllitis Scolopendrium (L.) Newm. 

 Hart's-tongue. Fig. 56. 



Asplenium Scolopendrium L. Sp. PI. 1079. I7S3- 

 Scolopendrium vulgare J. E. Smith, Mem. Acad. 



Turin 5: 421. 1793. 

 Phyllitis Scolopendrium Newm. Hist. Ferns, ed. 



2: 10. 1844. 

 Scolopendrium Scolopendrium Karst. Deutsch. 



Fl. 278. 1880-83. 



Rootstock short, erect or ascending, chaffy 

 with light brown scales, the leaves in a spread- 

 ing crown. Stipes 2'-6' long, deciduously 

 fibrillose-chaffy; blades simple, linear-ligulate, 

 7'-i8' long, i'-2j' broad, bright green, firm, 

 cordate or auricled at the base, entire or lightly 

 sinuate, usually repand; veins once or twice 

 dichotomous near the midrib, free; pairs of 

 sori distinct, 2"-8" long, the indusia whitish 

 at first, soon thrust back and wholly concealed 

 by the heavy lines of dark brown sporanges. 



Shaded limestone cliffs and depressions, in 

 central New York, near Woodstock, N. B., m 

 Bruce and Grey Counties, Ontario, and near 

 south Pittsburg, Tennessee. Very rare. Eur- 

 asia. Widely different forms are cultivated in 

 Europe. Snake-fern, Sea-weed fern. 



ii. CAMPTOSORUS Link, Hort. Berol. 2: 69. 1833. 



Slender ferns with narrow tapering simple entire or lightly sinuate leaves, bearing linear 

 or oblong sori several times longer than boad, 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. [Greek, 

 referring to the bent or curved sori.] 



Two species, the following, which is the generic type, the other of northern Asia. 



