on British Ferns. 
XXIX 
Ohs. — This genus is indicated by Presl under the title of Polypodi- 
um § Ctenopteris, but I am not sufficiently acquainted with the host 
of exotic species which that author has placed in his sectional divisions 
to express any opinion as to then- affinity. The genus, as restricted 
above, is sufficiently extensive, and has not, as far as my information 
extends, been previously isolated. 
Ctenopteris vulgaris. 
Polypodium vulgare, Linn. Sp. PL 1544; Light/. FI. Scot. 
667; ILiuls. FI. Ang. 455; With. Arr. 773; Sm. E.F. 
iv. 280, E. B. 1149 ; Mack. FI. Hib. 337 ; Newm. N. 
A. 13, F. Ill ; Hook, and Am. 566 ; Bab. 408. 
Polipodium vulgare, Bolt. Fil. Brit. 32, t. 18. 
Polypodium Ctenopteris vulgare, Presl, Tent. Pteridog. 179. 
Stipes articulated at the base, of nearly equal length with 
the frond ; frond pinnatifid. 
Walls, trees and hedge -banks, common. 
Obs . — The Polypodium cambricum of all authors is referable to this 
species. 
Obs. — The beautiful Davallia canariensis, which, together with the ex- 
tensive family to which it belongs, is intermediate between Polypodieae 
and Hymenophylleae, may possibly occur in the South-west of Ireland. 
Family. — Hiaienopiiylle.e. 
Frond appearing to consist of branched veins, each ac- 
companied throughout by a membranous wing or margin : 
cluster of capsules nearly spherical, seated on one of these 
veins which projects beyond the edge of the leaf, the clus- 
ter being inclosed in a kin d of cup-like involucre. 
Genus. — Trichomanes, Linneus. 
Involucre elongate, somewhat urn-sliaped : capsuliferous 
vein projecting beyond it in the form of a long stiff bristle. 
Trichomanes speciosum. 
Trichomanes speciosum, Willd. Spi. PI. v- 514; Newm. N. 
A. 29, F. 305. 
Trichomanes brevisetum, R. Br. in Ait. Hort. Kew. v. 529 ; 
Sm. E. F. iv. 324 ; Mack. FI. Hib. 344. 
