FILICES. 263 



spiny- toothed. Pinnae triangular-lanceolate in outline. 

 The variety intermedium, D. C. Eaton, which is very com- 

 mon in Canadian woods, has the margin of the indusium 

 denticulate and beset with minute stalked glands, the few 

 scales of the stipes pale brown with a dark centre, and the 

 lower pinnae, unequal- sided. Var. Boottii (A. Boottii, Tuck- 

 erman) has the scales of the stipe pale brown, the frond 

 elongated-oblong or elongated-lanceolate and pinnules less 

 dissected. Var. dilata'tum, Hook., has the scales of the 

 stipe brown with a dark centre, the frond broader, ovate or 

 triangular-ovate in outline, often twice-pinnate, and the 

 indusium smooth and naked. 



4. A. fra' grans, Swartz. Fronds 4-12 inches high, fra- 

 grant, narrowly lanceolate, with narrowly-oblong pinnately- 

 parted pinnae, their divisions nearly covered beneath by 

 very large thin indusia. Rocks, Atl. Prov. and northward. 



5. A. CFista'tum, Swartz. Stipes chaffy with broad scales. 

 Fronds large, linear-lanceolate in outline, once-pinnate, the 

 pinnae deeply pinnatified, the upper ones triangular-lanceo- 

 late in outline, the lower considerably broader, the lobes 

 cut-toothed. Fruit-dots large and- conspicuous, half way 

 between the midrib of the lobe and the margin. Swamps. 



Var. Clintonia'num, D. C. Eaton, is distinguished chiefly 

 by its greater size and more numerous pinnae and segments. 



6. A. Goldia'num, Hook. A fine fern, the large fronds 

 growing in a circular cluster from a chaffy rootstock. Frond 

 ovate or ovate-oblong in outline, once-pinnate, the pinnae 

 deeply pinnatifid, 6-9 inches long, broadest in the middle, the 

 lobes slightly scythe-shaped, finely serrate. Fruit-dots 

 large, near the midrib of the lobe. Rich moist woods. 



7. A. Fi'lix-mas, Swartz. (MALE-FERN.) Fronds lanceo- 

 late, very chaffy at the base, twice-pinnate except that the 

 upper pinnules run together. Pinnae linear-lanceolate, 

 tapering from the base to the summit. Pinnules very ob- 

 tuse, the basal ones incisely lobed. Fruit dots rather closer 

 to the midvein than the margin. Indusium convex, persist- 

 ent. Rocky woods, Atl. Prov, 



