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F E R N S OF NORTH AM E R IC A . 163
P l a t e LXVIII.
A S P ID IUM SP IN U LO SUM , Swartz.
Spinulose or Common Wood-Fern.
A s p i d i u m s p i n u l o s u m : — Root-stock stout, assurgent,
chaffy, covered with imbricated stalk-bases ; stalks a span’ to
a foot and a half long, chaffy, the scales rather large, ovate,
pointed, ferruginous, brown or brown with a dark central spot ;
fronds one to three feet long, all alike, forming a crown,
firmly membranaceous, half-evergreen, ovate to ovate-oblong,
twice to thrice pinnate; primary pinnæ mostly short-stalked,-
the lowest pair triangular-ovate or triangular-lanceolate, broadest
on the lower side, rather remote from the next pair, the
remaining pinnæ gradually narrower in outline and less
distant ; secondary rachises very narrowly wing-margined ;
pinnules oblong, sub-acute, pinnate or pinnately incised with
oblong obtuse spinulose-serrate lobes ; sori rather small, borne
on the back of the free veins or either apical or dorsal on
the veinlets; indusium flat, delicate, round-reniform, either
smooth or glandular.
Aspidmm spimdosum, S w a r t z , in Schraders Journal ( 1 8 0 0 ) ii., p. 3 8 ;
Syn. FIL, p. 54.— H o o k e r , Brir. FL, ed. i., p. 44 4 ; FL Bor.-
Am., ii., p. 2 6 1.— G r a y , Manual, ed. ii., p. 597 (excl. var.
Boottii).— Milde, Fil. Eur. et Atl., p. 132.
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