Descriptions of the Species. 
I 3 I 
83. A. furcatum. Frond two-pinnate, coriaceous, two to four inches 
broad, one to one and a half feet long ; pinnae and pinnules pointed, 
with scattered, woolly scales, on one or both sides. Rachis and stipe 
fibrillose. 
Var. /3. tripinnatum. Frond larger and more cut, less coriaceous, and 
less paleaceous. Stipe and rachis fibrillose. 
84. A. cicutarium. Frond six to fifteen inches long, four to six inches 
broad, three-pinnate. Segments linear, rachis naked. 
§§ Sori marginal or submarginal (Darea, Juss.). 
(78 A. gemmiferum, var. 7. discolor.) 
85. A. Dregeanum. Frond lanceolate, two-pinnate, six to fifteen inches 
long, one to one and a half inches broad. Pinnae one-half to three- 
quarter inches long, half-inch broad, with five to eight linear pinnules. 
86. A. Thunbergii. Frond lanceolate, two-pinnate, one to two feet long, 
three to six inches broad ; pinnae one and a half to two inches long, one- 
half to three-quarter inch broad, herbaceous. Segments linear, blunt, 
one line broad ; sori submarginal. 
87. A. flaccidum. Frond two-pinnate, coriaceous, often proliferous. 
Pinnae alternate, pinnules short pointed, simple, or lower one forked or 
pinnatifid. 
88. A. rutaefolium. Frond two to three-pinnate, sub-coriaceous, several 
pinnules forked or pinnatifid. Segments half-line broad in mature 
plant, broader when young and barren. 
§§§ Sori short, more or less curved, often horse-shoe shaped. Athyrium. 
Roth. 
89. A. Filix-foemina. Crown erect. Frond two-pinnate, green ; pinnae 
not widened to the base ; pinnules toothed, or slightly lobed. 
90. A. Schimperi. Rhizome slender, creeping. Frond one to one and a 
half feet long, three to four inches broad, lanceolate, three-pinnate ; 
pinnae widened to the base ; segments toothed. 
91. A. aspidioides. Frond ovate-deltoid, two to four feet "long, eight to 
fourteen inches broad, three-pinnate, with toothed segments. 
66. Asplenium Krausii. Moore. 
Plate LX. Fig. 2. Natural size. 
Crown erect, very slender, slightly paleaceous. Fronds green, 
herbaceous, and delicate, simply pinnate, lanceolate, four to six 
