HYMENOPHYLLUM. 
9 
H. TunbridgGnse (Sm.) A well known fern, forming dense 
carpets on moist rocks in many parts of Great Britain and Ireland. 
Fronds erect, flat, twice divided (pinnate) very delicate, serrated 
at the edges. Stalk wiry. Involucres nearly round, toothed at 
the top. Very humid, but airy. Dislikes water on the fronds. 
40° to 65°. 
unilatGralG (Willd.) H. Wilsoni (Hook.) Another British 
species, closely allied to to the preceding, hut differing in its 
more attenuated fronds, and pinnae curved to one size, as well as 
in its inversely pear shaped involucres. Very humid, but airy. 
30° to 60°. 
valvatum (Hook and Grev.) ? A charming species from the 
West Indies, with ovate, attenuated, nearly smooth dark green 
fronds, 6 to 12 inches long, thrice divided {tripinnatifid) and 
eveiyvFere beautifully undulated. Stalks black, wiry ; hairy 
when young. Veiy humid, but aiiy. 50° to 70°. 
