468 Proceedings of the Royal Irish Academy. 



P. angulare, IS'ewman. Largy ; Lough Eske. 



P. andeatum. Eoth. Lough Eske and river Eske; Loughhead 



river ; Eanymore water ; Einn, near Cloghaun bridge. 

 Cystopteris fragilis, Bernh. By the Erne, near Ballyshannon ; Brown 



Hall; Slieve League. AtJiyrmm filix f(smina, Both; Asplenium 



acUantum-nigrujii, Linn. A. trichomcmes, Linn. Erequent. 

 Asplenium viride, Huds. 1550 feet (and higher?) to 1200 feet on 



Slieve League. 

 A. marinum, Linn. Malinbeg ; Mucross Point ; Grlen Head. 

 A. ruta-muraria, Linn. Walls at Donegal, Lough Eske Castle, and 



Laghy ; rocks by the right bank of the Erne ; by Loughhead 



river, near Xillybegs ; St. John's Point. 



Scolopendrium vulgare, Sni. Blechnum loreale, Sw. ; Pteris aquilina, 



Linn ; frequent. 

 Ceterach offioinarum, Willd. Garden walls at Brown Hall, where 



I am informed by Mr. Brook, of Killybegs, it is abundant. 



Adiantiim capillus veneris, Linn. Slieve League, at Bunglass ; 



Tawny Bay to Teelin Bay ; Teelin Bay to Mucross Point. 

 Trichomanes radicans, Sw. Ardnamona woods. Killarney fern has 



also been discovered this year in Donegal, at the Poisoned Glen. 

 H ymenophyllum timlridgense, Sw. Lough Eske woods. S. wihoni. 



Hook ; Osmunda regalis, Linn. ; common. 



{Botrychium Itmaria, Sw. My visits have been too late for this plant ; 

 it is almost certain to occur on some of the bluffs by the sea, as 

 along Fintragh and St. John's Poiat.) 



Ophioglossum vulgatum, Linn. Close to Lough Eske Castle, Miss 

 Young. 



0. lusitanicum. Carrigan Head. 



N.B. — Eerns have been enumerated at length to show how rich 

 the district is ; almost all the group as represented in Ireland occur. 



Isbetes lacustris, Linn. Lough Esk ; lakes near Lough Erahesk ; 



Lough Agh, and other lakes. 

 Lycopodium clavatum, Linn. Mountains near Pettigo, Miss Young. 



Greenane. 



JO. alpinum, Linn. Slieve League, near the summit. 



L. selaginoides, Linn. Rocky headlands, sandy shores, and higher 

 mountains in wet places ; frequent. L. selago, Linn., frequent. 



I will now briefly enumerate the species which have not previously 

 been gathered in the county Donegal. I will first, however, have the 

 less pleasant duty of expunging, or at least casting a strong suspicion 



