Appendix. 



The following are new discoveries or new determinations, mostly from the 

 west, made while the work has been in press. 



[Vol. I: p. 2.] 2. Ophioglossum Engelmanni 



Prantl. Engehiiann's Adder's-tongue. 



(Fig. la.) 



Ophioglossum vulgalum Eaton, Ferns of the Southwest, U. S. 

 Geol. Surv. 340. 1878. Not L,. 1753. 



Ophioglossum Ens^elmanni Prantl. Jahrb. d. k. Bot. Gart. Ber- 

 lin, 3: 318. pi. S, fig. 17. 18S4. 



Rootstockcylindric; stems often several, 1-5 from the same 

 root, 3'-9' high, bearing the sessile fleshy elliptic leaf below 

 the middle; blade I'-sK' long, K'-2' wide, viH/i v.i<ie 

 obliijiie meshes eoiitaiiiiiig tniineroiis tuias/omofiiig vciiiulc/s, 

 the apex mucronula/e ; spike 6"-i2" long, apiculate, borne 

 on a stalk i'-4' long, sporangia 12-27 pairs. 



In damp, sterile places or on rocks in cedar woods, in tlie Cen- 

 tral States, from Indiana to Texas and Arizona, also in Virginia 

 April-Oct. 



[Vol. I: p. 2.] 3. Ophioglossum arenarium 

 E. G. Britton. Sand Adder's-tongue. (Fig. ib.) 



Ophioglossum arcnarinm E. G. Britton, Bull. Torr. Club, 24; 555. 

 pi. 31S. 1897. 



Rootstock slightly thickened, with i or 2 stalks; stem 



rigid, erect, 2'-7' high, bearing the sessile Innccolttte Jieshy 



leaf bt-loiv the miildlc ; blade l'-2' long, 3"-6" wide, acute 



or apiculate, not pellucid, with indistinct venation forming 



long narrow meshes, with few, if any, free veinlets; spike 



6"-l3" long, apiculate, borne on a stalk 2'-4' long, often 



twisted; sporangia 12-26 pairs. 



Gregarious in a colony of many plants in sandy ground under 

 trees at Holly Beach, New Jersey. The genus is also called Ad- 

 der's-fem, Adder's-spear and Snake-tongue. Julj-. 



[\'ol. I: p. 3.] 4a. Botrychium dis- 

 sectum Spreng. Cut-leaved Grape- 

 fern, or Moonwort. (Fig. 5a.) 



Botrychium disseclum Spreng. Anleit, 3; 172. 1S04. 

 Botrychium lernalum var. disseclum D. C. Eaton, 



Ferns N. A. i: 150. 1878. 



riant 8''-i6' high with slender fleshy stems. 

 Sterile portion long-stalked from near the base 

 of the stem with broadly deltoid basal divisions, 

 decomfound ; secondary' pinnae lanceolate from 

 a broader h^ie, pinnate -vith laciniatc and deeply 

 cut pinnules, the ultimate divisions divergent, 

 ^fe often two toothed at their apices, usuallj- less 

 than half a line wide; fertile portion with a 

 long stem, bi-tripinnate; bud pilose, enclosed in 

 the base of the stem, the apex of both portions 

 bent downward in vernation. 



In low grounds, rare in New England as far as 

 eastern Massachusetts, more common southward 

 from New York to Virginia and inland to Indiana 

 and Kentucky. 



