Portion of mature Frond, upper side.
ASPIDIUM RIGIDUM.
S w a r t z . S c h k u h r . H o o k e r and A r n o t t . W il l d e n o w .
S p r e n g e l .
P L A T E X X I . V O L . V I .
Aspidium fragrans,
“ pallidum,
“ nevadense,
“ Booihii,
“ argutum,
Polypodium rigidum,
“ fragrans,
“ heleopteris,
Lastrea rigida,
Nephrodium pallidum,
Polystichum rigidum,
strigosuni,
Dryopteris rigida,
Lophodium rigidum,
G r a y , {not o f S w a r t z .)
L tnr.
B o i s s i e e .
T u c k e r m a n .
K a u l e u s s .
H o f f m a n n .
ViLLARS, {not 0/ L i n n a e u s or H u d s o n . )
B o r k i i a u s e n .
P r e s l . B a b in g t o n . S o w e r b t .
N ewuman. M o o r e . D e a jo n .
B o e y .
D e C a n d o l l e .
B o t h .
G ray.
N e w m a n .
Aspidium—The Shield Fern. Rigidum—Bigid.
I n t h e S e c t io n L a s t r e a o f A u t h o r s .
T h e liig id Shield FVrii^ or, as Mr. Moore has now called it,
the “ Eigid Buckler Fe rn ,’' is a pretty hard}", deciduous British
