80 LEJEUNEA HOLTI, A NEW HEPATIC FROM KILLARNEY. 
Hepatice, certain genera represented in the Arctic region by but 
fow & ese most of them - rare occurrence, exist in the Tropical 
region in forms of almost endless diversity : te: are Lejeunea, 
— Plagiochila, Bazzania, &c., the known spatiale of the first- 
disa 
does this southern type cease on reaching the tropic of Capricorn, 
but is continued to the southernmost extremities of S. America and 
Africa, and to the Antarctic Islands, the flora of New Zealand 
showing a preponderance of the same tropical genera. It is tr 
that as we advance southward certain European types reappear, 
dd 
and a fe pec genera ar ed on, enough perhaps to 
justify the adoption of an Antarctic subregion. s, however, is 
a question which does not concern us at present 
hepatics of tropical type intrude so far into the Arctic region as at 
illarney. These quasi-tropical meter: being, as already shown, 
nearly alli ed to species existing at this day in Tropical America, it 
may ‘2 argued that they are really m igrants from that region, aod 
that they owe their actual specific oe ~ db isolation 
and changed conditions of existence. Thi may seem to an 
eres from the fact that one of the peeiaditind of Killarn 
us decipiens, exists there only in the male plant, and is ve 
course Daren; but plants of both sexes and fruit of a form of the 
pecies were ~ red by myself on the east side of the 
Guiitanien Andes (lat. 14° §. ) in 1857, and about the same time in | 
uba by Wright. Along with on ra in on Te sie 
eologists st allow us to call up an “Atlantis” frou the vasty 
deep; nor are there e any submerged islands, as between Madagascar 
= a, whose formerly protruded heads might have served as 
middle of the gulf-stream, almost the flora, mosses and 
hepatics included, is of arctic type, derived et from Europe, 
and that (so far as I know) n e of our Britannic Lejeunee exists 
there? Hookeria latevirens aie a0 or two other Azorean mosses 
are of tropical type, but Killarney one show a far greater proportion 
of such. Bermuda, although still a good distance from the American 
shore, is et nearer the tropic ied the West Indies than the 
