Hymenophyllum .] 
FERNS. 
65 
between them the midrib, to near the end of which are attached several ringed and 
petioled thecce, the annulus of which does not coincide with the petiole, but is 
placed transversely . (See Introduction.) 
1.— HYMENOPHYLLUM TUNBRIDGENSE. 
TUNBRIDGE FILMY FERN. 
(Plate VI, fig. 4.) 
Cha. — Leaf pinnate. Pinnae pinnatifid, erect. Lobes serrate. 
Leaf-stalk winged. Involucre orbicular, serrate at the top. 
Syn. — Hymenophyllum Tunbridgense, Smith, Willd., Hook., Mack., Swz., 
Gray. — Trichomanes Tunbridgense, Linn., Huds., With., Bolt., Lightf. — 
Trichomanes pulchellum, Salisb. 
Fig. — E. B. 102. — Hook, in Flo. Lon. 71. — Bolt. 31. — Flo. Dan. 954. — 
Hedw. 3. — Forst. in Flo. Tonb. ( excellent ). — Newm. p. 297 (1854). 
Des. — Root-stock black, fibrous, hairy, extensively creeping, 
rather upon than under the surface of the ground. Leaf-stalk 
naked on the lower part, capillary, black, broadly winged all the 
way down. Leaves solitary, at intervals along the creeping stem or 
root-stock, l to 2 inches high, of a light green colour. Pinnae alter- 
nate, growing quite upright, their veins dichotomously branched. 
Lobes sharply serrated or toothed, linear and blunt-pointed, running 
into each other, and seated chiefly on the upper side of what may 
be called the midrib of the pinna, but not wholly confined to that 
side, as in the next species. Receptacles formed from and in the 
place of the last lobe, on the upper side of each pinna ; thus they 
appear in two rows, one on each side of the rachis. The receptacle 
is composed of two flat or slightly convex, roundish valves, folding 
over each other, and sharply serrated at the points ; between which 
is a free column covered with thecae. 
Sit. — O n damp, shady rocks, generally among moss. 
Hab. — On the moist and shady sides and fissures of the various rocks near 
Tunbridge Wells, viz., the High Rocks, and the rocks in Eridge Park (abundant, 
1835), Mr. W. Pamplin. Clefts of the rocks at Wistman’s Wood, Dartmoor; 
rocks by Dunsford Bridge, Beckley Fall, &c., Devon, Flo. Dev. Greenfield, 
near Saddleworth, (very rare), Mr. W. Wilson. Near Halifax, Mr. Leyland. 
Near Cader Idris and Dolgelly, Mr. Bowman. Very abundant and fine near the 
Upper Lake, Killamey, Mr. W. Wilson. Powerscourt Waterfall, Glencree, and 
other places in the county of Wicklow, Mr. Mackay. 
Geo. — This, and probably the next species, are scattered over Europe from 
Italy to Norway. 
\ 
2.— HYMENOPHYLLUM WILSONI. 
NORTHERN FILMY FERN. WILSON’S FILMY FERN. 
(Plate VI, fig. 5.) 
Cha. — Leaf pinnate. Pinute semi-pinnatifid, recurved. Lobes 
serrate. Leaf-stalk scarcely winged. Receptacle ovate, entire. 
