80 Dr Lauder Lindsay on the Flora of Iceland. 
regard to the Cryptogams than to the Phanerogams. For in- 
stance, the collections I made in Iceland last summer, though 
very limited in extent and variety, have enabled me already 
to add several dozen species to the Lichens enumerated in 
the appended list. ButI do not incorporate these in the 
list; because, firstly, I have not yet thoroughly examined 
them microscopically, and cannot therefore as yet determine 
how many or what species are new to Iceland; secondly, I 
prefer reserving the results of my own botanical investigations 
and collections in Iceland for a separate communication ; and 
thirdly, my list appended professes only to come up to 1860. 
In regard to our present knowledge of the Icelandic Algee, Mr 
Croall informs me, ‘I have not the least doubt that the list 
of Iceland seaweeds might be doubled, perhaps trebled, by a 
careful search, especially as the Polar seas are much more fer- 
tile than the land. I wish I could have a week or two on its 
shores. . . . + Iam sorry I can add very little to the 
list, although I have looked over all the books I have. Very 
little seems to be known of the seaweeds of Iceland.” On the 
same subject Professor Harvey writes, “I have scarcely any 
Alge from Iceland. Sir William Hooker made a collection 
of them, but they were all lost at sea, except a few specimens 
of Rivularia (Tetraspora) cylindrica, and one of these, saved 
in his pocket-book, I possess.” And in regard to the Mosses 
and Hepatice, Dr Carrington observes, the list is “ evidently 
imperfect, and a good botanist might add many species of thesé 
tribes.” 
Notwithstanding the number of published works or papers 
on the Flora of Iceland, it must be confessed that but a frac- 
tion of the island has been thoroughly examined by com- 
petent botanists. Some parts of the island have never been 
explored by man at all! Such, for instance, is the range 
of the Klofa or Vatna-jokul in the south of Iceland, cover- 
ing a surface of several hundred square miles. Nor generally 
speaking, do the Icelandic Alps, the jokuls or mountains 
covered by perennial snow or ice, at and above an elevation 
of 3000 feet, appear to have been botanically explored. The 
dangers of ascent are such that only a very few of them have 
been visited by travellers of any kind, and we may therefore 
a 
