FILICES. (FERNS.) 661 



2. LORINSERIA, Presl. Sterile and fertile fronds unlike : veins of the sterile 



fronds forming many rows of meshes. 



2. W. angUStif61ia, Smith. Fronds pinnatifid; sterile ones (12' -18' 

 high) with lanceolate serrulate divisions united by a broad wing; fertile fronds 

 taller, with narrowly linear almost disconnected divisions, the areoles and fruit- 

 dots (4" -5" long) in a single row each side of the secondary midribs. (W. 

 onocleoides, Willd. "W. areolata, Moore.) Bogs, Massachusetts, near the 

 coast, to Virginia, and southward : rare. Aug., Sept. 



8. ASPLENIUM, L. SPLEENWORT. (PI. 17.) 



Fruit-dots oblong or linear, oblique, separate ; the straight, or rarely curved, 

 indusium fixed lengthwise by one edge to the upper (inner) side of the fertile 

 vein : in some species a part of the fruit-dots are double ; the fertile vein 

 bearing two indusia placed back to back. Veins free in all our species. (Named, 

 from a privative and OTT\T]V, the spleen, for supposed remedial properties.) 



1. ASPLENIUM proper. Indusium straight or slightly curved, attached to the 



upper side of the vein, rarely doMe. 

 * Indusium flat, orflattish, thin. (Fronds evergreen.) 

 -i- fronds pinnately lobed or parted, or simply pinnate. 



1. A. pinnatifidum, Nutt. Fronds (3' -6' long) lanceolate, pinnatijld, or 

 pinnate below, tapering above into a slender prolongation, " the apex sometimes root- 

 ing " ; lobes roundish-ovate, obtuse, or the lowest pair long-acuminate ; fruit-dots irreg- 

 ular, those next the midrib often double, even the slender prolongation fertile, 

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

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

 Walking-Leaf (Camptosorus), but the veins are free. Stipes brownish, becoming 

 green higher up, and so passing into the broad pale-green midrib. 



2. A. ebenoides, R. R. Scott. Fronds (4' -9' long) broadly lanceolate, 

 pinnatijld, below pinnate, the apex prolonged and slender ; divisions lanceolate from a 

 broad base, the lower ones shorter, often proliferous, as is the apex of the frond ; 

 fruit-dots much as in the last ; stipes black and polished, as is the lower part of the 

 midrib, especially beneath. Limestone cliffs on the Schuylkill, near Philadelphia, 

 R. R. Scott, F. Bourguin, frc. : very scarce, growing with Camptosorus and As- 

 plenium ebeneum, of which Rev. M. G. Berkeley ( Journ. Royal Horticult. Soc. 

 July, 1866) considers it a probable hybrid. 



3. A. Trich6manes, L. Fronds (3' - 8' long) in dense spreading tufts, 

 linear in outline, pinnate ; pinnce numerous, roundish-oblong or oval (3" -4" long), 

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

 the midvein forking and evanescent ; 'the thread-like stipe and rhachis purple- 

 brown and shining. (A. melanocaiilon, Willd.) Shaded cliffs: common. 

 July. (Eu.) A. viride, Huds., occurs in Canada, perhaps in N. New England. 



4. A. ebfcneum, Ait. Fronds upright (8' - 16' high) pinnate, lance-linear in 

 outline ; pinnce (' '- 1' long) many, lanceolate, or the lower oblong, slightly scythe- 

 shaped, finely serrate, sessile, the dilated base auricled on the upper or both sides ; 

 fruit-dots numerous on both sides of the elongated midvein ; stipe and rhachis 



'blackish-purple and shining. Rocky, open woods : rather common. 



