. Our native ferns and their allies [microform] : with synoptical descriptions of the American pteridophyta north of Mexico. Ferns; Fougères. V. Fio. 31.—Verna- tion of B. lunaria Swz. (After Dav- enport.) 70 OUR NATIVE FEXNS AND THEIR ALLIES. %\—12' high. Leaf usually sessile, borne at or above the mid- dle of the stem, pinnate with 2—8 pairs of lunate 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 st
. Our native ferns and their allies [microform] : with synoptical descriptions of the American pteridophyta north of Mexico. Ferns; Fougères. V. Fio. 31.—Verna- tion of B. lunaria Swz. (After Dav- enport.) 70 OUR NATIVE FEXNS AND THEIR ALLIES. %\—12' high. Leaf usually sessile, borne at or above the mid- dle of the stem, pinnate with 2—8 pairs of lunate 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. 4. B. negleotum Wood. Plant 2'—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: midveins 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. matricarice- 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 flabellately . Fig. m.—Vema- incised with acute lobes, or pinnately parted ; ium Wood! *>ifft'er secondary segments from a narrowed base, ovate, o*'«nport.) 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
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