2 
Illustrated by Meehan, Series i, Vol. 2, and in Gray’s Manual. 
Var. Cambricum is a form in which the lamina instead of being 
lobed is pinnate, the pinnae broad and overlapping, and themselves 
toothed and lobed. Seldom fertile. 
Illustrated by Anne Pratt, and in Eaton’s Ferns of N A. 
Tribe V, PTERIDEvT:. 
Fructification marginal or intra-marginal, the reflexed margins of 
the segments of the lamina serving as indusia. In our re- 
gion are included three genera, with four species. 
ADIANTUM L. 
36. A. pedatum L. Maiden Hair. Fronds 8-24 in. high, 
forked at the top of the black, shining stalk, the divisions once to 
thrice pinnate : ultimate segments very numerous, triangular ob- 
long ; sori roundish, beneath the membranaceous inwardly turned 
margins of the ultimate segments. Moist woods and shaded hill- 
sides. Generally distributed, but in most sections not common. 
North America generally, northern India and Japan. Aug.-Oct. 
Illustrated in Graj^’s Manual. 
PTERIS L. 
41. P aquilina L. Common Brake. 1-6 feet high; frond 
ternate, the divisions twice pinnate ; sori forming a continuous line 
along the margin of the oblong-lanceolate ultimate divisions. Well 
drained soil, usually in half shade. Common throughout New Eng- 
land, and distributed throughout the world. September. 
Illustrated in Gray’s Manual. 
A form of this fern occurs in which the frond is several times 
pinnate, but not ternate. 
PELLiEA Link 
67. P. gracilis (Michx ) Hook. Slender Cliff Brake. Stipes 
brown and shining, 2-3 inches long : laminae smooth and delicate, 
