802 



LASTREA DILATATA. 



the costa, and dentate. A handsome feather-like frond. The 

 pinnules near the rachis much changed, depauperated, or 

 frequently wanting. 



Fig. 247. 



Alpina, Moore. (Fig. 247.) — An elegant Fern, with a frond 

 of very thin and delicate texture, more so than in any other 

 variety. It was first found among rocks on the loftier portions 

 of Ben Lawers, in Perthshire. Mr. A. Croall has also found it 

 in Glen Callater, Braemer; Mr. W. Sutherland at Loch-na-gar, 

 (where it is dwarfed and depauperated;) Mr. F. Clowes, at 

 Hawes Water, Westmoreland; Mr. T. Blezard on the north-east 

 of Inglehorough, Yorkshire; Mr. Thomas Moore near Lancaster. 

 Mr. Moore also considers that the form found by Dr. Balfour 

 on Ben Voirlich, Perthshire, (known as montana,) is a dwarf 

 state of alpina. Fronds oblong, occasionally ovate in form. 

 Tripinnate below, bipinnate upwards. Pinna3 membranaceous, 

 ascending, obliquely deltoid, ovate below, and nearly equal 

 above; the basal pinnae are very uneqvial-sided. Pinnules 

 ovate or elongate-ovate, the lowest divided into serrate lobes. 

 Sori numerous and conspicuous, a double line. Scales entire 

 and broad. ]\Iy thanks are due to Mr. A. Tait and Mr. F. 

 Clowes for fronds. 



Angtjsta, Moore. — Found near Tunbridge Wells by the late 

 Miss Bower, and subsequently a somewhat similar form at 

 Hartland, Devonshire, by Mrs. Chanter. Bipinnate, about two 

 feet high, narrow linear-lanceolate. Pinnae briefly deltoid, the 

 basal ones very unequally deltoid, the posterior pinnules being 



