50 
FERNS. 
[ Hymenophyllum. 
upon than under the surface of the ground. Rachis naked on the 
lower part, capillary, black, broadly winged all the way down. 
Fronds solitary, at intervals along the creeping stem or root, one to 
two inches high, of a light green colour. Pinnae alternate, 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. — On damp, sliady 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 Bridge Park (abun- 
dant, 1835), Mr. W. Pamplin. Clefts of the rocks at Wistman’s Wood, Dart- 
moor, rocks by Dunsford Bridge, Beeky Fall, &c., Devon, Flo. Dev. Green- 
field, near Saddleworth (very rare), Mr. W. Wilson. Near Halifax, Mr. 
Leyland. Near Cadcr Idris and Dolgelley, Mr. Bowman. Mery abundant 
and fine near the Upper Lake Killarney, Mr. W. Wilson. Powerscourt 
Waterfall, Glencree, and other places in the county of Wicklow, Mr. Maclcay. 
Geo. — This and probably the next species are scattered over Europe from 
Italy to Norway. 
2.— HYMENOPHYLLUM WILSONI. 
NORTHERN FILMY-FERN. SCOTTISH FiLMY-FERN. 
. (Plate 4, fig. 5.) 
Cha. — Frond pinnate. Pinnae semipinnatifid, recurved. Lobes 
serrate, Rachis not winged. Receptacle ovate, entire. 
Syn. — Hymenophyllum Wilsoni, Hook' in Br. Flo., — Mark. 
Fig. — E. B., suppl. 2086. 
Des. — Rachis rigid, capillary, winged at the top. Frond one or 
two inches high, dark green. Pinnae alternate, bent backwards, 
growing horizontally rather than vertically as in the last species, 
besides which the lobes curve downwards, so that when the edge of 
them is looked at, they have a falcate appearance, although they 
are oblong and blunt, and it may be added, very sharply serrated. 
When in fruit, all the leafy expansions turn in one direction, and 
the fruit in the opposite. The receptacles are situated as in the last 
species, but are larger, very convex, perfectly ovate, and entire. 
The absence of wings to the rachis, the different habit, the semi-pinnatifid 
character of the pinnae, and the entire, convex receptacle, serve to distin- 
