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. Engelmann's Adder's- tongue. 



(Fig. ia.) 



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

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



Ophioglossum Engelmanni Prantl. Jahrb. d. k. Bot. Gart. Ber- 

 lin, 3: 318. pi. 8, fig. 17. 1884. 



Rootstock cylindric; stems often several, 1-5 from the same 



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



the middle; blade X'-^W long, ^ / -2 / wide, with -wide 



oblique meshes containing numerous anastomosing veinulets, 



the apex niucronulate ; spike 6 // -i2 // long, apiculate, borne 



on a stalk 1/-4/ long, sporangia 12-27 pairs. 



In damp, sterile places or on rocks in cedar woods, in the 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 arenarium E. G. Britton, Bull. Torr. Club, 24: 555. 

 pi. 318. 1897. 



Rootstock slightly thickened, with 1 or 2 stalks; stem 



rigid, erect, 2 / ~7 / high, bearing the sessile lanceolate fleshy 



leaf beloiu the middle; blade i / -2 / long, 3 // -6 // wide, acute 



or apiculate, not pellucid, with indistinct venation forming 



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



6 // -i3 // 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-fern, Adder's-spear and Snake-tongue. July. 



[Vol. i: p. 3.] 4a. Botrychium dis- 

 sectum Spreng. Cut-leaved Grape- 

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



Botrychium dissectum Spreng. Anleit, 3: 172. 1804. 

 Botrychium ternatum var. dissectum D. C. Eaton, 

 Ferns N. A. 1: 150. 1878. 



Plant %'-\d' high with slender fleshy stems. 

 Sterile portion long-stalked from near the base 

 of the stem with broadly deltoid basal divisions, 

 decompound ; secondary pinnae lanceolate from 

 a broader base, pinnate with /aciuiale and deeply 

 cut pinnules, the ultimate divisions divergent, 

 often two toothed at their apices, usually 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. 



