70 OUR NATIVE FERNS AND THEIR ALLIES. 



Fig. 31. — Verna- 

 tion of B. lunaria 

 Swz. (After Dav- 

 enport.) 



2^' — 12' high. Leaf usually sessile, borne at or above the mid- 

 dle of the stem, pinnate with 2 — 8 pairs of hinate or fan-shaped 

 lobes which vary from crenate to entire and are 

 either close and imbricated or somewhat distant; 

 sporophyll 2 — 3-pinnate, often dense, i' — 2' long, 

 often about the height of the sterile ; apex only 

 of the leaf bent over the nearly straight sporo- 

 phyll in vernation. Greenland to Alaska, south 

 to New York, Colorado, and British Columbia. 

 U^ 4. B. neglectum Wood. Planta' — 12'high, 

 often very fleshy. Sterile portion borne above 

 the middle of the stem, short- 

 stalked, ovate or oblong, i — 2- 

 pinnatifid or rarely 2-pinnate, 

 with obtuse divisions and narrow 

 toothed segments : midyeins dis- 

 appearing by continued branch- 

 ing ; sporophyll 2 — 3-pinnate, 

 often much branched ; spores 

 tuberculate; apex of both leaf and sporophyll 

 turned downward in vernation. {B. 7natricarice- 

 folium of former editions, not of A. Br., and 

 apparently distinct from the species of Europe.) 

 Nova Scotia to New Jersey, west to Ohio and 

 Washington. 



5. B. boreale (Fries) Milde. Plant 2\' — 7', 

 smooth, fleshy ; sterile segment placed above the 

 middle, sessile, cordate, ovate or deltoid, pin- 

 nately parted, acute ; lowest segment spreading 

 from a narrower base, ovate or cordate-ovate, 

 acute, all entire, or here and there fiabellately 

 incised with acute lobes, or pinnately parted ; 

 secondary segments 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. Unalaska. 



1 1 Vernation wholly inclined, recurved in the sporophyll ; 

 leaf triangular, sessile. 



Fig. 32. — Verna- 

 tion ot B. negUc- 

 tum Wood. (After 

 Davenport.) 



