The Lichens of the Isle of Pines

The collection of lichens forming the basis of the present paper was made by Dr. and Mrs. N. L. Britton and Mr. Percy Wilson in February and March, I916. A few specimens were collected by Dr. 0. E. Jennings in I9ro. The collection is of unusual interest on account of the large representation, 67 numbers in all, of rock-inhabiting lichens. Very little is known about the rock lichens of the West Indies. The only important collection of them, hitherto, was made by W. R. Elliott in the islands of Dominica and St. Vincent in I891 and 1892; an account of Elliott's collections being given by Wainio in the London Journal of Botany for I896. Charles Wright's rich collection of the lichens of Cuba included very few specimens on rocks. This probably accounts, in part at least, for the relatively large number of new species described in this paper. The lichen flora of the Isle of Pines, so far as known at present, includes 49 genera with 127 species, of which I genus, 14 species, and I variety are new. Of the new species, i grow on rocks. Three of the new species are already known from other tropical localities, and until the rock lichens of Cuba are known it is obviously impossible to say how many species are endemic in the Isle of Pines. For the same reason, comparison of the lichen flora of the Isle of Pines with that of other islands in the West Indies would, at present, be valueless. It can be stated, however, that the number of distinctively tropical species is very large. In the following list, localities outside of the Isle of Pines are cited only in cases where the distribution is restricted or little known.