Incrementa florae jamaicensis. 75 
Lacovia, Black River, Malvern, Santa Cruz Mountains), Trelawney 
(ausser den Küstenregionen besonders Troy und Tyre im östlichen 
Theile des Cockpit Country, hier im Mai 1903, April, Juni und De- 
cember 1904, November 1905, September 1906), St. James (Montego 
Bay, Kempshot Hill, Catadupa, Lapland), Hanover (Lucea, Green Is- 
land, Belvidere und besonders Dolphin Head), Westmoreland (Shaftston, 
Grand Vale, Negril, die Ränder des Greät Morass, Darliston, Blue- 
fields etc.). 
Harris theilte mir über die Vegetation Jamaicas folgende Beob- 
achtungen mit: The difference in temperature at the various altitudes 
are appreciable, but shade and moisture are more important factors 
in influeneing the distribution of species. Many plants that grow at . 
high altitudes may also be found in heavy woodland at lower elevations 
when moisture and other conditions are favourable for their growth. 
Some species are able to adapt themselves to eircumstances and are 
widely spread, being found practically everywhere from sea-level to 
the summit of the highest mountains, whilst others are confined to 
very limited areas. Laelia monophylla, for instance, is found only on 
trees on the ridges of a limited area of the St. Andrew mountains; 
but there are other species each of which, to the best of our present 
knowledge, is confined to a very small area in one locality. — There 
is a general resemblance in the flora of Mount Diablo, the Cockpit 
Country and Dolphin Head, but each of these regions has produced 
many species which are peculiar to it. — Orchids are found from 
the coast to the summit of the Blue Mountains, but the majority of 
the species occur at mid-elevations, 2500 — 3500 feet altitudes. They 
are prineipally epiphytes, but are also found on rocks, on banks and 
amongst mosses. — Ferns, of which there are about 500 species, are 
practically everywhere, but they abound in the wet woods in the 
higher altitudes and probably four-fifths of the known species may 
be found in the Blue Mountains. These are of all sizes from delicate 
filmies like lace-work to giant tree ferns attaining a height of 40 feet, 
with magnificent erowns of fronds. 
Am 8. Mai 1903 kam Harrıs zum ersten Male in das Cockpit 
Country nach Troy, einen Ort im westlichen Centrum der Insel, an 
der Grenze der Parishes Trelawney, St. Elizabeth und Manchester ge- 
legen, dessen Name sich bei früheren Sammlungen, soviel ich weiss, 
niemals findet; die Gegend stellte offenbar, wie sich auch aus den 
mitgebrachten Pflanzen ergab, ein völlig unerforschtes Terrain dar. 
Nach Prof. Brırrov, der Harrıs auf seiner letzten Reise dorthin be- 
gleitete (Journ. New York Bot. Gard. VII. 1906 p. 247) ist es schr em 
 klüftet. Der Boden besteht aus sehr porösem Kalkstein, in dem durch a 
