18 IS.Woodsia. 1. FILICES. Pl.end.cu 



p. llvense, With. 774. 

 P. hyperbnreuin, Swart, Syn. F. 39. 

 Ceteiach alpinum, Bee. Syn. FL Gall, 1435. 

 Woodsia hyperborea, Brown T.L.S, li, 123. 

 Redrattleleafed stonefern. 



Alpine rocks ; perennial ; June. 



Root cesp'itose; fronds spreading, 2 to 4< in. high, lan- 

 ceolate, rather obtuse, both faces hairy ; rachis hairy ; leaf- 

 lets not very close, heartshape, pinnatifid, dilated at the 

 base; lobes rounded, rather convex, with the edges turned 

 up, scarcely crenate, not armed ; sori roundish, hairy, nu- 

 merous, growing at length quite close, brovv'n. 



XIV. 14. TRICHOMANES. Dioscorides. Filmfern. 



Sori marginal ; capsules sessile, inserted into a cylindrical 

 common receptacle, contained within a one-leaf, pitcher- 

 shape open involucrum of a similar texture with the frond j 

 surculi creeping, downy ;y7*owc^5 pellucid, divided into areolae, 

 very seldom undivided, commonly pinnatifid ; lobes one- 

 ribbed ; involucra terminal ; receptacle mostly extended and 

 elongated. 



Trichomanes brevisetum. Shortbristlefil'mfern. 



Fronds 2 or 4, pinnatifid, smooth ; leaflets one flowered; 

 lobes linear; with the margin unnicked; involucra topshape, 

 hollow, wingless ; apex simple, not nicked ; receptacle hardly 

 exserted ; stipes winged. 



Filix fcemina q. F. humilis repens, foliis pellucidis et splendentibus, 

 caule alato llichardson, Raii Syn. 127, 14. 



Trichomanes pyxidifernm, Huds. FL Ang. 46!, 

 Hvmenophyilmn alatum, Ling. B. 20, 1417. 

 H~ Tunbridgense ,2. Smith F. A. 1542. 

 Trichomanes brevisetum, Brown inAitun 11. K. 5, 529. 

 Cwp goldilocks. 



Shady springs and rocks; perennial; May and June. 

 Frond 4 or 5 inches high, thin, transparent, dark green. 



XV. 15. HYMENOPHYLLUM. Smith. Dwarfern. 



Sori marginal, inserted into a cylindrical receptacle, in- 

 cluded within a bivalve involucrum; surculi erect, to- 

 XiiQiVio^Q \ fronds pellucid, divided into areolae, pinnatifid j 

 lobes one-ribbed; involucrum terminal; receptacle not ex- 

 serted. 



