CHAr. XVI.] 
THE BRITISH ISLES. 
343 
six in India and Ceylon, five in Java, two in Africa, and three in the 
Antarctic Islands, and one in Ireland. 
Hookeria (restricting that term to the species referable to Cyclodictyon) 
is still a large genus of handsome and remarkable mosses, having twenty- 
six species in the Andes, eleven in Brazil, eight in the Antil'fes, one in Mexico, 
two in the Pacific Islands, one in New Zealand, one in Java, one in India, 
and five in Africa — besides our British species, which is found also in 
Madeira and the Azores but in no part of Europe proper. 
These last two are very remarkable cases of distribution, since 
Mr. Mitten assures me that the plants are so markedly different 
from all other mosses that they would scarcely be overlooked in 
Europe. 
The distribution of the non-European genera of Hepaticae is 
as follows : — 
Acrobolbus. A small genus found only in New Zealand and the adjacent 
islands, besides Ireland. 
Lejeunia. A very extensive genus abounding in the tropical regions of 
America, Africa, the Indian Archipelago, and the Pacific Islands, reaching 
to New Zealand and Antarctic America, sparingly represented in the British 
and Atlantic Islands, and in North America. 
Petalophyllum. A small genus confined to Australia and New Zealand 
in the southern hemisphere, and Ireland in the northern. 
We have also a moss — Myurium hebridarum — found only in Scotland and 
the Atlantic Islands; and one of the H ep atic se — Mas tigophara woodsii — 
found in Ireland and the Himalayas, the genus being most developed in 
New Zealand, and unknown in any part of continental Europe. 
These are certainly very interesting facts, but they are by no 
means so exceptional in this group of plants as to throw any 
doubt upon their accuracy. The Atlantic islands present very 
similar phenomena in the Rkamphidium purpuratum, whose 
nearest allies are in the West Indies and South America ; and 
in three species of Sciaromium, whose only allies are in New 
Zealand, Tasmania, and the Andes of Bogota. An analogous 
and equally curious fact is the occurrence in the, Drontheim 
mountains, in Central Norway, of a little group of four or five 
peculiar species of mosses of the genus Mnium, which are found 
nowhere else ; although the genus extends over Europe, India, 
and the southern hemisphere, but always represented by a very 
few wide-ranging species except in this one mountain group 1 1 
1 I am indebted to Mr. Mitten for this curious fact. 
