Ttttt Leaves 3-pinnajid to 3-pinnate. 
* Lower pinnae broadly tri-angular. 
9. D. spinulosa (Retz.) Kuntze. Plo, 
Polypodium spinulosum Retz. 1795. Fl. Scand. 
ed. 2. 250. . . 
Aspidium spinulosum Sw. Schrad. Journal Bot. 
1800: pt. 2. 38. Haton, l.c. 2: 163; in Gray, 1. 
©, 687. Clute lac. 
Nephrodium spinulosum Desv.; Hook. 1861. Br. 
ernst, %o. Waterss cad 
Dryopterts spinulosa Kuntze, 1891. Revis. Gen. 
2: 813. Underw. in Ill. Fl. 1: 18; Nat. Ferns 
EE4e ua btitts be CalLO. 
Woop FERN. 
‘Plants 5 dm. more or less in heigth; leaves ovate- 
lanceolate; lower pinnae 6 cm. or less in length, the 
basal pinnules exceeding the others in length; upper 
pinnae elongate-triangular to oblong, acuminate; pin- 
nules oblong, acute, decurrent, pinnatifid; lobes spinu- 
lose-dentate ; sori small, usually on to each lobe. 
In moist woods. 
** Lower pinnae triangular-ovate. 
D. spinulosa intermedia (Muhl.) Underw. PREG 
Polypodium intermedium Muhl.; Willd. 1810. 
Spe rcleespezo2s 
This form differs from the type by its larger and more 
spreading pinnae. The basal pinnules of the lower pin- 
nae are usually equal to or shorter than the adjacent pair. 
45 
