ASPLENIUM PINNATIFIDUM, Nuttall. 
Pinnatifid Spleenwort. 
Asplenium PINNATIFIDUM : — Root-stock short, creeping, 
branched ; stalks numerous, clustered, brownish near the base, 
green higher up ; fronds six to nine inches high, herbaceous or 
sub-coriaceous, mostly erect, lanceolate-acuminate from a broad 
and sub-hastate base, pinnatifid ; lower lobes roundish-ovate or 
rarely caudate, sometimes distinct, the margin crenated, the upper 
ones gradually smaller and more and more adnate to the winged 
midrib, the uppermost very short, and passing into the sinuous- 
margined long acumination of the frond ; veins dichotomous or 
sub-pinnate and forking, free ; sori few on the lower lobes, soli- 
tary on the uppermost, those next the midrib occasionally dipla- 
zioid. 
Asplenium pinnatifidum, Nuttall, Genera of N. Amer. Plants, ii., p. 251. 
— Kunze, in Sill. Journ., July, 1848, p. 85. — Gray, Manual. — 
Eaton, in Chapman’s Flora of Southern U. S., p. 592. — Hooker, 
leones Plantarum, t. 927; Sp. Fil., iii., p. 91. — Mettenius, Fil. 
Hort. Lips., p. 72, t. 10, figs, i, 2 ; Asplenium, p. 126. — Hooker 
& Baker, Syn. Fil., p. 194. 
Asplenium rhizophyllum, var. pinnatifidum, Muhlenberg, Catalogus Plant. 
Am. Sept., ed. ii., p. 102. — Barton, Compendium Florae Philad., 
ii., p. 210. — Eaton,’ Manual of Botany, ed. iii., p. 188, etc. — 
Torrey, Compendium, p. 383. 
’ Prof. Amos Eaton, grandfather of the present writer. Eaton’s “ Manual 
of Botany” went through eight editions from 1817 to 1841. 
