532 100. FILICES. 



Tribe V. Hymenophyllea. 



15. TKICHOM'ANES Linn. 



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

 segments uniform linear, involucres solitary in the axils of the 

 upper segments, receptacle at first included ultimately very pro- 

 minent. J B. 1417. T. speciosum Willd., N. 305. Fronds 

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

 hard wiry branched ribs each with a rather membranous winsr. 

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

 The form called Andrewsii has lanceolate fronds and winded 

 involucres. N. 315. Very damp shady places, rare. For- 

 merly at Bellbank, Yorkshire ! (exactly" Bolton's t. 30). X. 

 Wales! Arran ! (S.). Killarney ! [and other parts of Ireland]. 

 P. IX. X. E. S. I. 



16. HiME2s T oPHYL'LUM Sm. Filmy-Fern. 



1. H. tunbridc/erise (Sin.); fronds pinnate, pinnae distichous, 

 segments linear undivided or bifid spinously -serrate, involucre 

 compressed spinmi sly -serrate, rachis broadly winged. JE. B. I(>L>. 

 H. F. 43. N. 32 1 . Slender, delicate and small. Rhizome ver v 

 long, threadshaped. ' Pinnae, rachis, and involucres in the same 

 plane. Inv.-valves adpressed throughout the greater part of 

 their length, slightly gibbous at the base. Amongst moss in 

 damp and shady places. P. VII. E. S. I. 



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

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

 flated entire, rachis slightly bordered. E. B. S. 2(386. H. F. 

 44. H. unilaterale Bory ? Resembling the preceding, but the 

 pinnae curve backwards and the involucres forwards. Inv.- 

 valves convex or gibbous throughout, touching only by their 

 .edges which are quite entire. Amongst moss in damp and 

 shady places. P. VII. E. S. I. 



Suborder II. Osmundacea. Tr. VI. Osmundea. 



17. OSMUN'DA Linn. Flowering-Fern. 



1. O. regdlis (L.) ; fronds bipinnate, pinnules oblong nearly 

 entire dilated and slightly auricled at the base, clusters panicled 

 terminal. E. B. 209. H. F. 45. N. 331. Fronds erect or 

 drooping, 18 feet high. Boggy places. P. VII. IX. E. S. I. 



