178 : BRITISH FERNS. 
that the fronds hang in a natural position. It some- 
times happens that the mass refuses to apply itself — 
closely to the mortar, in which case a piece of fine 
galvanized zine wire may be bound twice or three 
times round the pot, fern and all, taking care not to 
injure the fronds, which may be readily so arranged 
as entirely to conceal the wire: then fill a saucer 
with wet Sphagnum, and strew the surface with silver 
sand; place the inverted pot thus prepared in the 
saucer, and cover with a bell-glass, the rim of which 
will sink into the Sphagnum: the luxuriant growth of 
the fern is certain. 4 
46. ONE-SIDED FILMY FERN. Usirarenace. : 
Hymenophyllum unilaterale, Willdenow. B. F. 901. : 
Hymenophyllum Wilsoni, Huoker, - 
The rootlets and candices of the One-sided Filmy 
Fern offer no characters by which I can distinguish 
them from those of the Tunbridge species: the young 
fronds of both are convolute ; they make their ap- 
pearance late in the summer months, and usually 
remain green throughout the winter, turning com- 
pletely black in the ensuing summer. frond 
consists of brunched veins, clothed wi 
