246 Proceedings of the Royal Irish Academy. 



and easily-decomposed siliceous basalt that renders the soil of the trap 

 so fertile. It is thus explained by an early writer, G. B. Sampson, 

 in his Survey of Londonderry. Th6 following is a list of the alpine 

 species observed : — 



Draha incana, Sieracium anglicum, 



Silene acmdis, Vaccinium vitis idcea, 



Bryas octopetala, Salix herhacea, 



Saxifraga stellaris, Carex rigida, 



8. oppositifolia, Lycopodium selaginoides. 



Of these, Saxifraga stellaris and Carex rigida were found in Tyrone, 

 and are therefore additionsto District 10. The latter(from Sawel station) 

 is also an addition to District 12. Listera cor data was also added 

 to the flora of District 10. 



General List oe Plants found on the Derry Mountains arranged 

 IN Descending Order, the Ubiquitous Species being Omitted. 



Sawel, 2200 feet. 



Carex rigida., Good, to 1730; also at 1850 feet on Dart, and at 1780 

 feet on Mullaghclogha. 



Mullaghclogha, 2000 feet. 



This was the summit which appeared most likely for Ruhus clianK^moriis, 

 and agreed best with the description. Its summit is a wet 

 tussocky bog of Erica cinerea, Eriopliora, Aira flexuosa, Agrostis 

 mdgaris, Carex hinervis, and C. rigida. I searched it and its 

 western shoulders for the cloud-berry in vain. 



Dart, 1850 feet. 



Carex pilidif era, Linn. 

 Lycopodium alpinum, Linn. 



Mullaghclogha, 1800 feet. 



Cardamine pratensis, Linn. 

 Viola palustr is, Linn. 

 Montia fontana, Linn. 

 Erica tetralix, Linn. 

 Myosotis cmspitosa, Shultz. 

 Carex stellulata, Good. 

 Lycopodium selago, Linn. Mullaghmore at 1700 feet. 



Dart, 1780 feet. 

 Saxifraga stellaris, Linn. 



