684 FiLiCES. (ferns.) 



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



pinnatijid, 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, Conn, and Penn., and 

 southward; very rare, usually growing with Camptosorus and Asplenium 

 ebeneum, of which Rev. M. G. Berkeley considered it a probable hybrid. 

 * * Small evergreen f ems ; the narrow fronds simply pinnate with numerous pinncB. 

 -t- PinncE not auricled. 



3. A. Viride, Hudson. Fronds (2 - 5' long) tufted, linear in outline, pale 

 green, softlij herbaceous; pinnce roundish-ovate or ovate-rhomboid, short-stalked, 

 crenately toothed (2 - 4" long), the midvein indistinct and forking ; the slender 

 stipe brownish and passing into a green herbaceous rhachis. — Shaded cliffs; 

 northern New Eng., west and northward; rare. (Eu.) 



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

 linear in outline, dark green and more rigid ; pinnce roundish-oblong or oval (3 - 4" 

 long;, entire or creuulate, rarely incised, unequal-sided, obliquely wedge-trun- 

 cate at base, attached by a narrow point, the midvein forking and evanescent ; 

 the thread-like stipe and rhachis purple-brown and shining. — Shaded cliffs; 

 common. July. (Eu.) 



-t- -I- Pinnm more or less auricled. 



5. A. parvulum, Mart. & Gal. Fronds upright (4-10' high), narrowly 

 linear-oblauceolate ; pinme (2 - 6" long) rigid and thickish, mostly opposite, nearly 

 sessile, somewhat deflexed, oblong, obtuse, entire or crenulate, auricled on the 

 upper or both sides ; sori rather few, as near the margin as the continuous 

 midvein ; stipe and rhachis black and shining. — Mountains of Va. to Mo., 

 and southward. — Nearly intermediate between the last and the next. 



6. A. ebeneum, Ait. Fronds upright (9- 1 8' high), linear-oblanceolate 

 in outline, fertile ones much the taller; pinnce (6-18" long) firmly membra- 

 naceous, mostly alternate, sessile, spreading, oblong or oblong-linear, ^ne/y ser- 

 rate or even incised, the base auricled on the upper or both sides ; sori many, 

 nearer the elongated midvein than the margin ; stipe and rhachis blackish- 

 purple and shining. — Rocky, open woods ; rather common. 



» * * Small evergreen ferns ; the broader fronds l-3-pinnate; pinnce incised. 



7. A. BradldjTi, D. C. Eaton. Fronds oblong -lanceolate, 4-7' long, besides 

 the blackish and somewhat shining stipe, membranaceous, pinnate ; pinnae 

 rather numerous, the lower ones no larger than the middle ones, all short-stalked, 

 oblong-ovate, obtuse, incised or pinnatifid into oblong toothed lobes. — On 

 rocks, Ky. and southward ; rare. A single plant has been gathered near New- 

 burg, N. Y. — Intermediate between A. ebeneum and A. montanum. 



8. A. montanum., Willd. Fronds ovate-lanceolate from a broad base {2 ~ 

 5' long), subcoriaceous, pinnate ; pinnae ovate-oblong, the lowest pinnately cleft 

 into oblong or ovate cut-toothed lobes, the upper gradually simpler ; rhachis 

 green, broad and fiat ; stipe brown at base. — Cliffs and rocks, from Conn, and 

 Penn. to Ky., and southward. July. 



9. A. Rilta-mur^ria, L. Fronds deltoid-ovate (1-2^' long), subcori- 

 aceous, laxly 2-3-pinnate at base, the pinnae alternate; ultimate segments few. 



