FILICES. 137 



scales linear-subulate, very acute, with stalked glands. Fronds 

 several from each crown, ascending. Stipes wiry, from as long as to 

 twice as long as the lamina, purplish-brown for about half its length 

 from the base, green in the upper half, channelled above, with a few very 

 narrow deciduous brown scales, but no glands. Lamina rather thick, 

 subcoriaceous, nearly opaque, glabrous, dim, evergreen, triangular- 

 strapshaped or triangular-linear, pinnate ; lowest pinnae larger than 

 the succeeding ones, rather shortly stalked, ascending, trifld or 

 incised ; middle pinnse smaller and more shortly stalked than the 

 basal ones, incised or undivided, curving inwards towards the rachis, 

 narrowly wedgeshaped and entire at the base, oblanceolate or strap- 

 shaped-oblanceolate at the apex only ; uppermost pinnse sessile, linear, 

 entire or with one or two teeth at the tip, a few of the uppermost 

 ones confluent with the terminal lobe of the frond. Rachis green, not 

 winged. Pinnae or ultimate segments flabellately veined, without a 

 distinct mid-vein. Sori linear-oblong or linear, situated about the 

 middle of the pinna?, ultimately confluent. Indusium quite entire. 

 Spores tuberculated, with rather large blunt tubercles. 



On rocks. Local and very rare. Between Llanrwst and Capel 

 Curig and Bwlch-y-Rhyn, Denbigh, and Moel Lechog, Carnarvon ; 

 Helvellyn and Borrowdale, Cumberland ; Kyloe Crags, Northumber- 

 land. On the Tweed two miles from Kelso, and on Minto Crags, 

 Roxburghshire ; three miles from Dunfermline, Fife (now extinct 

 according to Mr. C. Howie) ; Stenton Rock near Dunkeld, Perth. 

 Reported also from Culborne, Somerset ; from Arthur's Seat and 

 Blackford Hill, Edinburgh ; from near Perth, and from almost in- 

 accessible rocks near Airlie Castle, Forfarshire. 



England, Scotland. Perennial. Summer, Autumn. 



Fronds 1 to 5 inches high, of which the stipes is generally the 

 greater part. Lowest pinnae ^ to ^ inch in length. A. Germanicum 

 is liable to be confounded with elongated forms of A. Ruta-muraria, 

 but the stipes is without glands, more wiry, and a much greater part 

 of it is darker-coloured and very persistent, so that tufts of old 

 plants remind one of those of A. Trichomanes. The frond is thinner, 

 of a paler green ; the pinnae less divided, more shortly stalked, more 

 incurved, shorter and more deeply crenate or serrate at the apex ; 

 the sori are longer, with the indusium quite entire ; the spores are 

 considerably smaller and with fewer tubercles than in any form of 

 A. Ruta-muraria. 



Bory considers this species a hybrid between A. Ruta-muraria and 

 A. septentrionale, and Ascherson a hybrid between A. septentrionale 



VOL. XII. T 



