130 OUR NATIVE FERNS AND THEIR ALLIES. 



with the sterile segment composed of two or three pinnately 

 incised divisions form the var. compositum Lasch. New Eng- 

 land, New York and northward, the variety in Wyoming Ter- 

 ritory and California. 



** Vernation partly inclined in one or both portions. 

 t Buds smooth ; sterile segments sessile or short-stalked ; plant 

 small, fruiting in early summer. 



2. B. lunaria Swz. (MOONWORT.) Plant 5' 8' high, 

 fleshy; sterile segment nearly sessile, borne near 

 the middle of the stalk, oblong, simply pinnate 

 with 5 15 lunate or fan-shaped lobes which are 

 crenate, incised, or entire, close and overlapping, 

 or distant ; fertile segment bi tripinnate, pan- 

 icled, about the height of the sterile. Apex 

 only of sterile segment bent over and outside of 

 the nearly straight fertile segment in vernation ; 

 divisions of sterile frond arranged nearly perpen-' 

 dicularly. (Fig. 32.) Connecticut, New York, 

 Lake Superior, Colorado, and British Columbia. 

 3. B. boreale Milde. Plant 2^' 7' high, 

 \/lfff smooth, fleshy; sterile segment placed above the 

 [ Ml/ middle, sessile, cordate, ovate or deltoid, pin- 



FIG. 32. Verna- nately parted, acute ; lowest segment spreading 

 Swz (Affer*Sav*- from a narrower base, ovate or cordate-ovate, 

 enport.) acute, all entire, or here and there flabellately 



incised with acute lobes, or pinnately parted ; secondary seg- 

 ments from a narrowed base, ovate, acute, serrate, the upper 

 spreading, quickly decreasing, finally elliptical, acute; fertile 

 segment bi tripinnate, panicled. Apex of sterile segment 

 bent over inside of the nearly erect fertile one in vernation ; 

 divisions of the sterile segment arranged on an angle. Una 

 laska. 



4. B. matricariaefolium A. Br. Plant 2' 12' high, usually 

 fleshy ; sterile segment placed above the middle, short-stalked 

 or sessile, ovate or oblong, pinnately parted into ovate-oblong, 

 obtuse, rounded, entire, incised, pinnatifid, or pinnately parted 

 segments, the narrow divisions linear; fertile segment i 3 pin- 

 nate, panicled, often very much branched; spores thickly cov- 

 ered with large rounded warts. Apex of both segments turned 



