20 Proceedings of the Royal Irish Academy. 



Htdeoceakidace^ . 



Elodea canadensis (Rich.) — Drain on the Island of Trasna, and in other 

 places. Not plentiful now. I was informed that a few years 

 ago this plant, which the natives call "eel-weed," threatened 

 almost to fill up Lough Erne. When introduced it spread with 

 great rapidity round the islands and shores. It has since de- 

 creased equally fast. 



\_8tratiotes aloides (Linn.) — This species was not seen in Lower Lough 

 Erne, nor in that portion of the upper lake I examined. The 

 immediate neighbourhood of Crum Castle was visited, but the 

 district between Crum Castle and Belturbet, where it is reported 

 to grow plentifully, was not gone over.] 



Oechidace^. 



Orchis mascula (Linn.) — On "White Island. Not common. 



0. incarnata (Linn.) — Common. Devenish, &c. 



0. maculata (Linn.) — Common generally. 



Gymnadenia conopsea (Brown). — Rare. Only seen by the roadside, 



near Ely Lodge, when going to Enniskillen from Belleek. 

 G. alhida (Rich.) — Rare. On the slopes of the hill over the lower 



lake at Pollaphuea. 

 Halenaria viridis (Brown). — In the same locality as the last species. 

 H. lifoUa (Bab.) — On White Island, and fields near Blaney Bay. 



Not nearly so common as H. chlorantha. 

 H. chlorantha (Bab.) — This species and the next are the commonest 



orchids about Lough Erne. 

 Lister a ovata (Brown).— Abundant. 

 Neottia nidus-avis (Rich.) — Under the old beeches opposite Crum 



Castle. Sparingly. 

 JEpipactis latifolia (Auct.) — Common, especially under beech trees. 



I cannot distinguish between this species and E. media. 



Ieidace^. 

 Iris pseudacorus (Linn.) — Very common generally. 



LlLIACE^. 



Scilla nutans (Sm.) — Common. In great quantity in some places. 

 Allium ursinum (Linn.) — Common. 



JYarthecium ossifraywn (Huds.) — On the hill over the lake at Polla- 

 phuea ; not seen at a lower level. 



JuNCACE^. 



Luaula pilosa (Willd.) — Rather common. 



L, sylvatica (Beck.) — Abundant in many places. 



