594 FELICES. (FERNS.) 



1O. ASPL-felVIUlTI, L. SPLEEXWORT. (Tab. 11.) 



Fruit-dots linear or oblong, oblique, separate; the indusium attached length- 

 wise by one edge to the upper (inner) side of the simple, forked or pinnate, free 

 veins, and opening along the other: rarely some of the fruit-dots are double 

 (DIPLAZIUM), two indusia being then borne on the same vein, back to back. 

 (Named, from a privative and <nr\r)v, the spleen, for supposed remedial prop- 

 erties.) 



1. ASPLENIUM PROPER. Indusium narrow, fixed by its whole length. 

 #= Indusium flat or flattish, thin. (Fronds evergreen.) 



1. A. pinimtifidlim, Nutt. Fronds (3'-6'long) diffusely spreading, 

 lanceoTate, pinnatifid, sometimes pinnately parted near the base, tapering above into 

 a slender prolongation, the apex sometimes rooting; lobes roundish-ovate, obtuse, cut- 

 toothed or nearly entire; the midrib evanescent by forking below the apex. 

 Cliffs on the Schuylkill and Wissahickon, near Philadelphia, and southward 

 along the Alleghanies; also sparingly westward: rare. July. Resembling 

 the Walking-Leaf (Caraptosorus), but the venation is that of Asplenium : fruit- 

 dots irregular, numerous, even the slender prolongation fertile. 



2. A. IllOlltfllllllll, Willd. Fronds (3' -5' high, bright green) lanceolate 

 or triangular-oblong in outline, pinnate; the ovate pinna; 3-7 '-parted (or the upper 

 barely cleft) and cut-toothed ; the veins forking from a midrib. Cliffs, in the 

 Alleghany Mountains, from Pennsylvania ( Mr. Lea) to Virginia, and southward. 

 July. Rhachis green: stalk brownish. Much smaller than the European A. 

 Adiantum-nigrum. 



3. A* Itiitii-niiil'aricl, L. Fronds (2' -4' long) Z-pinnate below, simply 

 pinnate above, ovate in outline, the few divisions narrowly rhombic-wedge-shaped, 

 toothed at the apex, without a midrib, the veins all rising from the base. Lime- 

 stone cliffs, Vermont to Michigan, Virginia, and southward along the moun- 

 tains; scarce. July. (Eu.) 



4. A. Xricli6manes, L. Fronds (3 1 - 8' long) in dense spreading tufts, 

 linear in outline, pinnate : pinnae numerous, roundish-olilong or oval (3" -4" long), 

 unequal-sided, obliquely wedge-truncate at the base, attached by a narrow point, the 

 midrib evanescent ; the thread-like stalk and rhachis purple-brown and shining. 

 (A. melanocaulon, Willd.) Shaded cliffs ; common. July. (Eu.) 



5. A. ebeneuill, Ait. Fronds upright (8' -16' high), pinnate, lance-linn tr 

 in outline ; pinme ('-!' long) many, lanceolate, or the lower oblong, slightly 

 scythe-shaped, finely serrate, sessile, the dilated base auriclcd on the upper or 

 both sides; fruit dots numerous on both sides of the elongated midrib; stalk 

 and rhachis blackish-purple and shining. Rocky, open woods ; rather common. 



* * Indusium strongly convex or vaulted, thickish : fruit-dots numerous and crowded 

 on both sides of the midrib, parallel, some of them occasionally double, especially in 

 No. 7. (Fronds thin, smooth, decaying in antunui, l-3 high.) 

 C. A sillgltstifoliillll, Miehx. Fronds simply pinnate; pinnas linear- 

 lanceolate, acute, minitcly wavy-toothed (3' -4' long) ; fertile fronds more con- 



