﻿[*Avena strigosa Schreb. Castell-fan-grach ; Pont-rhyd-fendi- 

 gaed.] 



\Melica unifiora Eetz. Parson's Bridge. 

 iPoa pratensis L. Common near Aberystwith, &c. 

 Festuca ovina L., vivipara. Summit of Plinlimmon, by the big 

 cairn, 2460 ft. 



Lolium perenne L. Careful search revealed only the awnless 

 form in the hills; v. aristatum Schum. was found in the lower 

 country at Capel Bangor. 



Pteris aquilina L. Our top limit for the bracken is at 1500 ft. ; 

 the mean of readings at 13 different places, mostly facing south, is 

 1270 ft. 



t Lastrea dilatata Presl. Frequent. Devil's Bridge ; Henffordd 

 Arms ; Llanfihangel Lledrod ; Llyn Hir (1400 ft.). 



Lycopodium Selago L., L. clavatum L., and L. alpinum L. All 

 common. They occur most frequently about the top limit of the 

 bracken. L. Selago was observed growing with L. alpinum at the 

 top of Plinlimmon (2460 ft.). It and L. clavatum were seen at Lletty- 

 bach (facing north), at 210 ft. L. alpinum was not seen below 

 700 ft. (under Bryn-bras, facing north-east, no Pteris) ; and L. cla- 

 vatum was not observed above 1680 ft., but probably may be found 

 at greater heights. 



From our observations we find that Watson's agrarian zone is 

 more restricted in this neighbourhood than might be expected. If 

 the bracken grows to 1900 ft. in the East Highlands, we should 

 expect to get it possibly at 2300 ft., or at any rate 2000 ft. in Mid 

 Wales. Watson gives the average for the south face of the 

 Grampians as 1500 ft. ; our average is 1270 ft. Thus it appears 

 that the arctic zone is nearer sea-level in Mid Wales than in the 



15001 21001 



* Baker and Newbould, Notes on the Flora of Matlock, Journ. Bot. xx 

 p. 334. 1884. 



t Baker, On the Upland Botany of Derbyshire, Journ. Bot. xxii. p. 6. 186 

 \ Baker, A Flora of the English Lake District. London, 1885. 

 § Watson, Cybele Britannica. London, 1847. 



!| This extreme was in Radnorshire, £ mile from the Cardigan boundai 

 The locality is rocky, and we may have an upward trespass. Elsewhere tl 

 limit was usually below 1400 ft. 



1 The variety humifuta Dicks, ascends higher, to 2700 and 3750 ft. 



