428 99. FILICES. 



upon a fine membrane and covered by the membranous continua- 

 tion of the epidermis. Inferior pinnules pinnatifid or sinuate or 

 entire. Woods and heaths. P. VII. 



15. ADIANTUM Linn. Maiden-hair. 



I. A. Capillus-Veneris (L.); frond irregular, branches and 

 roundish-wedgeshaped lobed thin pinnules alternate, lobes of the 

 fertile pinnules terminated by a transversely linear-oblong re- 

 flexed lobe covering several roundish clusters, sterile lobes ser- 

 rate. E. E. 1564. N. 83. Rhizome blackish, shaggy. Fronds 

 6 12 in. high. Stipes and rachis slender, nearly black. Pin- 

 nules not jointed to the partial stalks. Damp rocks near the 

 sea. P. V. IX. 



Subord. II. Hymenophyllacea. Tr. V. Hymenophyllea. 



16. TRICHOMANES Linn. 



1. T. radicans (Sw.) ; fronds 3 or 4 times pinnatifid glabrous, 

 segments uniform linear, involucres solitary in the axils of the 

 upper segments, seta at first included ultimately very prominent. 

 E. B. 1417. T. speciosum Willd., A T . 305. Fronds rather 

 triangular, very much divided, 4 8 in. long, formed of hard 

 wiry branched ribs each with a rather membranous wing. Rhi- 

 Eome black, downy, very long. Involucres scarcely winged. 

 . Andrewsii (Newm.) ; fronds lanceolate, involucres winged. 

 N. 315. Very damp shady places, rare. Formerly at Bellbank, 

 Yorkshire, from whence I have an old specimen exactly like 

 Bolton's figure t. 30. South and south-west of Ireland. P. 

 IX. X. E. I. 



17. HYMENOPHYLLUM Sm. Filmy-fern. 



1. H. tunbridgense (Sm.) ; fronds pinnate, pinnae distichous, 

 segments linear undivided or bifid spinosely-serrate, involucre 

 compressed spinosely serrate, rachis broadly winged. E. B. 162. 

 N. 321 . Slender and delicate. Rhizome very long, threadshaped. 

 Pinnae, rachis and involucres in the same plane. Valves of the 

 involucre adpressed throughout the greater part of their length, 

 slightly gibbous at the base. Amongst moss in damp and shady 

 places. P. VII. 



2. H. Wilsoni (Hook.) ; fronds pinnate, pinnae recurved, seg- 

 ments linear undivided or bifid spinosely-serrate, involucre in- 

 flated entire, rachis slightly bordered. E. B, S. 2686. Resem- 

 bling the preceding, but the pinnae curve backwards and the 



