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FERNS OF NORTH AMERICA.
P i a t e XIII.
A S P ID IUM U N ITUM , v a r . G LA B RUM , M e t t e n i u s .
R oun ded Sh ie ld -F e rn .
A s p id iu m u n i t u m , var. g l a b r u m : — Root-stock elongated,
creeping in advance of the fronds ; stalks few, scattered, smooth,
one to two feet high ; frond nearly or quite as long as the stalk,
oblong in outline, rigid, sub-coriaccoiis, smooth, pinnate, the apex
abruptly contracted and pinnatifid ; pinnæ numerous, short-stalked,
sub-equal, or the lowest ones a little shorter, pinnatifid about half
way to the midrib into rounded or obtuse closely-placed lobes ;
veins pinnate, the lowest ones of contiguous lobes united, and
sending out a veinlet to the sinus between the lobes, where the
second pair of veins meets it, and sometimes the third also ; the
upper veins straight and simple ; sori forming a continuous intramarginal
line around the pinnæ, and often extending down
nearly to the midrib ; indusium rather persistent, roimd-reniform,
commonly quite smooth.
Aspidium unitum, var. glabrum, M e it e n iu s , in Ann. Mus. Bot. Lugd.-Batavi,
i., p. 230. — E aton, in Bull. Torr. Club, iv., p. 19. — C h a pm an , in
Botan. Gazette, iii,, p. 20.
Nephrodium unitum, a, gongylodes, B a k e r , Syn. Fil., p. 289.
Aspidhcm goggylodus, S c h k u h r , Krypt. Gew., p, 193, t. 33, c.
Aspidium gongylodes, M e t t e n iu s , iiber Aspidium, p. l o i .
Aspidium ßcklonii, K u n z e , in Linnæa, x., p. 546.— M e t t e n iu s , 1. c., p. l o i .
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