192 The Irish Naturalist [July, 



Dromineer to Mount Shannon. Five minutes on the rough 

 grits here gave Cotyledo7i Umbilicus, Galium saxatile, Pyrus 

 Aucuparia, Vacciniuni Myrtilhis, Digitalis ptapurea, Scilla 

 nutans, Luzula maxima^ and Lastrcca dilatata, not one of which 

 had turned up in all the five days spent on the limestone 

 farther north. And similar results had been arrived at in the 

 hour spent on the Woodford bogs two days before when sail- 

 ing down from Portumna. Here on the pure peat Gnaphalium 

 uliginosuvi, Senccio sylvaticus, Calluna vulgaris^ Erica TetraliXy 

 Runiex Acctosella, /uncus supimis, and Loniaria Spicant 

 immediately presented themselves when one passed from the 

 limestone to the over-lying peat. 



The most obvious characteristic of the Lough Derg flora is 

 to be found in the great preponderance of a group of species, 

 many of which are decidedly uncommon in various parts of 

 Ireland. Omitting the very common plants,'the chief members 

 of this group are the following : — 



Char.\cteristic Pi<ants of Lough De:rg. 



Hypericum perforatum. Eupatorhiin Cannabinuin. Erythraa Ccntauriutn, 



Geranium sanguineum. Solidago Virg-Aurea. Gentiana Arnarclla. 



Rhamntis catharticus. Antemiaria dioica. Lycopus etiropaus. 



Rnbiis cctsitis. Carlina vulgaris. Teucriiim Scordiuju. 



Rosa spinosissiina. Cniais pratensis. Litorella lacustris, 



Parnassia palustris. Lysimachia vulgaris, [mtipertts cojumtinis. 



Viburnum Opulus. Saviolus Valerandi. Scka'nus Jiigricans. 



Galium boreale. Chloj-a perfoliata. Selaginella selaginoides. 



Hardly an islet or promontory was landed on all down the 

 lake, at least from Portumna to Mount Shannon, about which 

 point a change of rock takes place, that this group did not 

 present itself in full development. Some of the lonely rocky 

 islets rising a few feet above the lake surface were positively 

 ablaze with the coral berries of the Viburnum, standing out 

 against the sober ashen green of the Juniper ; the Dew-berry 

 threw out its handsome bronzed streamers far over the naked 

 limestone, and right in the wash of the waves the Water 

 Germander {Teucriuvt Scordizim) spread its matted roots 

 through the shingle. However bare of novelty many of these 

 desert islets may have been, and the uniformity of conditions 

 was undoubtedly accompanied by a strong uniformity of 



