HYMENOPH YLL UM. 



333 



New Zealand, in Chiloe, &c. It is also more widely spread througliout 

 England, Scotland, Ireland, and Wales than H. tunhridgense. In Wales it is 

 met with on Snowdon, near Llanberis Pass, and on the adjacent mountains, 

 especially near Twll-du and on rocks near Pont Bren over a gulf of the 

 River Rheidol. In Ireland it is found in most counties, but principally in 

 Killarney, on the Kerry mountains, and in Connemara. In Scotland its 

 distribution is very wide in Ayr, Peebles, Stirling, Forfar, Perth, Argyle, 

 Ross, &c., but it is commoner in Argyleshire and at Finlarig Burn, near 

 Killin, in Perthshire, than in any other localities. Its presence in England 

 is recorded from various counties, among 

 which we note Cornwall, Devon, Stafford, 

 Salop, Lancashire, Yorkshire, Northum- 

 berland, Westmoreland, Cumberland, &c,, 

 the principal localities where it has been 

 gathered being near the waterfall at 

 Ambleside ; at Black Rocks of Grreat 

 End, in the Scawfell Range, and at 

 Scale Force Fall, near Buttermere ; at 

 Greenfield, near Saddleworth, and near 

 Silverdale. 



H. unilaterale is altogether of more 

 rigid habit than H. tunhridgense^ from 

 which it is also distinguished by its 

 leaflets, of a very dark colour though re- 

 markably transparent, being curved and 

 repeatedly divided, but not fan- shaped 

 (Fig. 85). The stalks of the fronds are round and almost black, and the sori 

 (spore masses), disposed in the axils of the leaflets, instead of being stalkless 

 as in H, tunhridgense, are distinctly though shortly stalked. Another peculiarity 

 of this little plant is the repeated elongation of its fronds, which not only 

 endure for several years but renew their growth annually — a circumstance 

 first pointed out by Mr. F. Clowes, of Windermere. It succeeds well under 

 the treatment recommended for H. tunhridgense. H. Wilsoni of Hooker is 

 identical with this species. — Hooker, Synopsis Filicum, p. 67. Nicholson, 

 Dictionary of Gardening, ii., p. 167. Lowe, Our Native Ferns, ii., t. 73. 



f/^. 85. Hymenophyllum unilaterale, showing Habit, 

 and Detactied Pinnule with Involucre 

 (Habit, nat. size ; detached Pinnule enlarged). 



