FILICES. 80 



pinnule or segment, and extending nearly to its apex. Indusium 

 rather firm, persistent, roundish-reniform, convex (often very much 

 so), denticulate, with a few sessile and globular glands round the 

 margin, and in some cases with very slender jointed filaments ter- 

 minated by minute glands. Spores bluntly tuberculate, with a few 

 sparse large rounded tubercles. No sterile fronds dissimilar to the 

 fertile ones. 



On rocks and banks, and in woods. Local. Frequent in the 

 south-west of England, extending east to Sussex and to Kent, 

 near Tunbridge Wells ; north of this it occurs in Hereford, Salop, 

 Glamorgan, Pembroke, Merioneth, Carnarvon, Anglesea, North 

 Lancashire, West Yorkshire, Cumberland, and the Isle of Man, 

 with outlying stations in Forge Valley near Scarborough, Cheving- 

 ton Wood near Workworth, Rugely Wood near Alnwick, and 

 several stations near Embleton, Northumberland. Dumbarton, the 

 Clyde Isles, Mull and Skye, and the Hebrides ; recorded from 

 Berwick, Roxburgh and Forfar. It is abundant in the Wauk Mill 

 Bay, Orphir, Orkney ; and the late Dr. T. Anderson found it rather 

 common in Hoy, but there I have only seen it on Hoy Hill, and in 

 Fara and Calf of Flotta ; Dr. H. Halcro Johnson informs me that it 

 is abundant on the Calf of Cava, in Scalpa Flow. In Ireland it is 

 distributed from north to south, but it is most plentiful in the west. 



England, Scotland, Ireland. Perennial. Summer, Autumn. 



Caudex producing a number of crowns, which are closely packed 

 together, in this respect resembling the caudex of L. rigida. Fronds 

 8 inches to 3 feet high, of which the stipes is usually about half ; it 

 is, for more or less of its length from the base upwards, tinged with 

 purplish-brown, and is not so deeply furrowed as in L. dilatata 

 and L. spinulosa. Lamina vivid green, crisped, from the tips of the 

 ultimate pinnules and segments being turned upwards, covered on 

 both sides with minute glands like those of L. rigida, which it also 

 resembles in the texture of its fronds, which are firm and almost rigid, 

 without being coriaceous. A r eins clavate towards the apex, as in 

 the other species, and not extending quite to the teeth of the lobes. 

 Sori large, with the indusium much more convex than in the other 

 spinulose Lastrese, almost as much so as in L. rigida. In British 

 specimens the jointed filaments round the edge of the indusia can 

 seldom be found, though I have observed them in Plymouth speci- 

 mens ; but in those from the Azores they are much more frequently 

 met with. The spores resemble those of L. Filix-mas, L. rigida, 

 L. cristata, and L. spinulosa, in having a few large rounded tubercles 

 and no minute acute ones. 



VOL. XII. N 



