Plants I- 1 .5 dm. high ; leaves linear, rather rigid; 
pinnae very numerous, subequal, obtuse, entire or nearly 
so, 0.5 cm. or longer, auricled on the upper side; stipes 
black, shining. 
Onlimestone rocks. 
Alexandria Co., Va., P.Lhner^ Lexington, Wafers. 
*** Pinnae oblo7ig ^ mostly alternate, 
5. A. platyneisron (L.) Oakas. PL 4. 
Trichomanes major foil is longis^ auriculatls , 
Banist. Cat. ; Kay, Hist. 2 : 1928. 
Acrosticum platyneuron L,. 1. c. 1069, 
Asplenlum ebeneum. Alt. 1789. Hort. Kew. 3: 
462. Eaton ^ 1. c. I : 21 . t. 4. f . I ; in Gray, 1. 
c. 684. Clute., 1. c. 160. Waters^ 1. c, 144. 
A. platyneuron Oakes ; Eaton, 1. c. 24 in note. 
Underw. in 111. Fl. i : 23 ; Nat. Ferns 104; in 
Britt. 1. c, II 
Ebony Spi.eenwoiit. 
Plants 2-5 dm. high; leaves linear, tapering towards 
the base ; pinnae oblong, truncate at the base, sessile, 
auricled on the upper side, 1-3 cm. 1., denticulate or some- 
times incised. 
I n r o c k y p 1 a c e s . April-September. 
Ttt Leaves pinnate to j-pinnatlf Id, 
* Leaves 2'plnnxtlf Id below\ pinnate above, 
38 
