18 



LOCALITIES. 



England.! Unknown. 



Ireland. ) 



Wales. Caernarvonshire, ou the side of Glyder mountain facing Trevan, 



above Llyn-y-cwn. Messrs. Janson, Woods, Borrer &r Wilson. 

 Scotland. Ben na Mac Dhui, Ben na bourd, Loch na gar, Mountains in 



Braemar, Glen Dole, Clova Mountains ; Drs. Balfour and 



Greville and Mr. Campbell. Cairngorum range, Sir W. J. 



Hooker. Invercauld Woods, Aberdeenshire, Mr. W. Brand. 



Sow of Athol, a mountain beyond Dalnacardock, Perthshire, 



Prof. Graham. 



Although one of the commonest Norwegian and Swedish species, 

 the Interrupted Club-Moss is of rare occurrence in the British Isles. 

 In England and Ireland it is entirely unknown : in Wales it appears 

 to be confined to a single locality, the side of Glyder mountain above 

 Llyn-y-Cwn. It was first discovered in this locality by Llwyd and 

 Ray; the former of whom speaks of its occurring abundantly.* Dille- 

 nius corroborates this statement,t and the habitat has been established 

 by modern botanists: Messrs. Borrer, Janson, Woods and W. Wil- 

 son, have seen the plant growing in the same spot, but all these 

 gentlemen found it very sparingly; and in 1839, when I diligently 

 searched the mountain- side, I could not find a single plant : therefore, 

 although the observation of Ray is most satisfactorily established, it 

 is still doubtful whether the habitat is likely to be preserved, and even 

 whether the plant is not now confined to Scotland, where it grows at 

 great elevations, and in wild and exposed situations. I am indebted 

 to Drs. Greville and Balfoiu: for specimens from the localities which I 

 have recorded. 



The interrupted club-moss appears to have been well known to our 

 earliest botanists, although nothing remarkable has been recorded of 

 its history. The best figure is that in Dillenius ;t that in the posthu- 

 mous volume of Morison edited by Bobart§ is also good; Plukenet's|| 

 figure is much too small to give a satisfactory idea of the plant. 



* Copiosum observavimus in monte Rhiwn Glyder, supra lacum Llyn-y-cwn. Rail 

 Syn. 108. 



f Ed. Llwyd primus in Arvonia observavit in monte Rhiwr Glyder, supra lacum 

 Llyn-y-cwn prope ecclesiam S. Perisii, nee non in depressis ejusdem montis Glyder 

 qua rupem y Tryvan spectat, quo in loco ipse etiam copiose ante 14 annos vidi. Dil- 

 lenius, 455. 



+ Dillenius, Historia Muscorum, 455, tab. 63, fig 9. 



§ Morison (Bobart) Hist. Plant, iii. 264, sec. 15, tab. v. fig. 3. 



II Plukenet, Phytographia. 



