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XXYII. 
REPOET OF EXAMIjS'ATIOI^ OF THE MOSSES, HEPATICS, 
AJS^D LICHEjSTS OF THE MOURIs^E MOUNTAIN DISTEICT. 
By HENEY WILLIAM LETT, M.A., Dub. 
[Eead May 13, 1889.] 
In the Spring of 1883, the Academy made me a grant of £10 for 
the purpose of investigating the Mosses and Lichens of the Mourne 
Mountains. 
I have since then spent, from time to time, upwards of eight weeks 
collecting specimens o£ the cryptogamic flora of this district, and have 
now the honour of presenting a report of the result of my rambles and 
examinations. 
In the district of the Mourne Mountains I have included from 
Slieve Donard, in the Co. Down, on the east, to Slieve Gullion, in Co. 
Armagh, on the west ; and from Slieve Croob, in Co. Down, on the 
north, to Carlingford Mountain, in Co. Louth, on the south. 
This area does not coincide with the botanical divisions of the 
Cybele Hibernica, but it is more natural and convenient, the whole 
district being quite distinct and separated by a long distance from any 
other range of mountains. It includes, roughly speaking, about 560 
^square miles, the distance from Slieve Donard to Slieve Gullion being 
.20 miles, and from Slieve Croob to Carlingford Mountain 28 miles. 
Speaking petrologically, the range is composed of granite and basalt 
veins intruding through each other, and schist. There is no sandstone 
found within the limits, and no lime or kindred rocks, except at the 
extreme southern boundary, near the entrance to Carlingford Lough, 
where carboniferous limestone occurs in small quantity. 
The scene of my investigations embraces varying elevations, from 
the sea level where St. George's Channel laves the bases of several of 
the mountains up to the highest of these (Slieve Donard) which, at not 
more than one mile from the coast, attains an elevation of 2786 feet, 
the highest point in Ulster. It is intersected by deep valleys and 
rocky glens with their streams, and contains several lakes and 
R.I.A. PEOC, SER. ITI., VOL. I. X 
