326 CRYPTOGAMIA— FILICES. Osmimda. 



branched, smooth, or sometimes downy, with solitary 

 ribs, wiry stalks, and creeping slender t^oots. Covers 

 solitary at the ends of some of the inferior and shorter 

 segments, terminating the rib, entire or serrated. Na- 

 tives of wet mossy rocks, or trunks of trees, most plen- 

 tiful in tropical countries. One species only is of Eu- 

 . ropsean growth. 



1. H. tunbridgense, Tunbridge Filmy-fern. 



Frond doubly pinnatifid, smooth. Segments and covers 

 sharply toothed. Fructifications solitary, from the lower- 

 most of the secondary segments, at the upper edge. 



H. tunbridgense. Fi.Br.\\A\. Engl. Bot. v. 3. t. \62. WiUd. Sp. 

 Pl.v.5.520. Sym.Syn.]9D. Hook. Loud. t.7\ . Scot. p.2. \d7. 



Trichomanes tunbridgense. Linii. Sp. PL \ 561. Huds. 46\. With. 

 781. Bolt. Fil. 58. t.3\. FL Dan.t.954. 



Adiantum petrjEum perpusillum anglicum, foliis bifidis vel trifidis. 

 RaiiSyn.ed.2.47.ed.3. 123. Hist.v.3.77. 



A. radicosumhumi-sparsum J eterectius. Pluk.Almag. 10. Phyt. 

 t.3.f.5,6. 



Darea tunbrigensis minor. Petiv. Mus. cent. 8. n. 762. 



Muscus palustris anglicus, foliis integris, bifidis et trifidis, sparsim 

 nascentibus. Moris, v. 3. 627. sect. 15. t. 7.f. 50. 



M. moiitanus italicus, adianthi foUis. Bocc. Mus. 24. t.2.f. 1. 



Amongst moss, in watery shady places, in the rocky or mountain- 

 ous parts of Great Britain. 



Perennial. May, June. 



The roots are long, slender, smooth, wiry, creeping horizontally. 

 Fronds scattered, erect, about one-third the size of the Tricho- 

 manes last described, and like that, smooth, of a filmy pellucid 

 texture, curling up as they dry ; the stalk wiry, without any 

 wing or border; segments linear, obtuse, single-ribbed, sharply 

 toothed, especially in their upper part. Covers of two erect, 

 converging, nearly orbicular, equal leaves, toothed in like man- 

 ner, solitary at the base of the primary divisions, on the upper 

 edge, with more or less of a stalk. Dr. Hooker's figures and 

 history of this and the foregoing are peculiarly excellent. 



Mr. Menzies brought the present plant from the Cape of Good 

 Hope J and it grows in most parts of Europe, from Norway to 

 Italy, but has not been observed in Germany or Switzerland. 



** Capsules, or seeds, isoitJiout any distinct elastic ring. 

 Habit 'various. 



474. OSMUNDA. Osmund-royal. 



Unn. Gen. 559. Juss. 15. Fl. Br. 1107. Sw. Syn. Fil 160. Willd. 

 Sp.PLv.5.96. Br. Prodr. \63. Tourn.t. 324. Lam.t.865.f.2. 



