[ 112 ] 



YII. 



ADDITIONS TO THE HEPATICJE OE THE HILL OE HOWTH, 

 WITH A TABLE SHOWING THE GEOGEAPHICAL 

 DISTRIBUTION OF ALL THE SPECIES KNOWN TO 

 GPOW THERE. Bx DAYID McARDLE. 



[COMMTTNICATED BY P. W. MOORE.] 

 [Eead April 13th, 1896.] 



In the summer of 1893, shortly after writing a provisional list of 

 the " Hepaticse of the Hill of Howth," which the Royal Irish Academy 

 did me the honour to puhlish,^ I was engaged in making further research 

 on the hill ; and I was fortunate in gathering a liverwort, which was 

 new to me, growing in some quantity amongst the limestone rocks 

 near Ballykill. I had very little difficulty in determining its correct 

 name to he Jungermania attenuata. It belongs to the barlata group, 

 and was figured by Sir William Hooker in his fine work on the 

 British Hepaticse, under the name of Jungermania harhata, (3 minor. 

 A specimen collected by Mr. E. M. Holmes at Abbey Wood, Kent, 

 which is included in Carrington and Pearson's excellent Fasciculus 

 (No. 74), quite settled the identification. 



This was apparently the first discovery of Jungermania attenuata in 

 Ireland. It grows most luxuriantly in company, and mixed with a 

 pretty moss Tetraphis pellucida, which also seems hitherto to have 

 escaped notice in the county Dublin district. Professor Lindberg, in his 

 " Musci Scandinavica," calls the former Jungermania gracilis, Schleich ; 

 and Mr. M. B. Slater, f.l.s., to whom I sent specimens of the Howth 

 plant, says : — " It is a pity the name attenuata has priority, as gracilis 

 is more expressive of its habit of growth." 



This interesting find was encouraging, and Mr. Moore wrote to 

 Captain Rochf ord (Lord Howth' s agent) for permission to collect in the 

 demesne, which was kindly granted for the first four months of last 



^ Proceedings, 3rd Ser., vol. iii., p. 108. 



