ASPIDIUM. 



459 



Trigvylchan (D. Lhwyd)." It has been found in England, near Settle, in 

 Yorkshire ; on Swarth Fell, near Ulleswater, and in other parts of Cumber- 

 land ; on Snowdon and also on Glyder, near Llanberis, in Wales ; in 

 Ireland on Bandon Mountains, in a glen east of Lough Eske, Donegal, and 

 on Grlenade Mountain, Leitrim. It is in Scotland, however, that the plant 

 is most abundant, being common in the Highland valleys and on exposed 

 mountain sides — on the Breadalbane Mountains, Perthshire, at an elevation 

 of about 3000ft. ; on Clova Mountains and in Glen Isla, Forfarshire ; on Ben 

 Lawers and Falcon Clints, near Chaldron Spout, Teesdale ; also on Ben 

 Lomond, in Sutherland, in Aberdeenshire, &c. 



A. Lonchitis, as found in 

 all the above-mentioned places, 

 has a thick and almost woody 

 rootstock densely covered with 

 the imbricated (overlapping) 

 bases of former stalks. The 

 newer portion is of a very 

 chatty nature, being thickly 

 clothed with large, egg-shaped 

 scales of a peculiar rusty-brown 

 colour. Its fronds, which are 

 Stiff and of a leathery texture, 

 of a smooth and shiny nature, 

 and very dark green in colour, 

 are disposed in a regular, 

 shuttlecock fashion at the top 

 of the rootstock (Fig. 68), are 

 borne on scaly stalks lin. to 

 4in. long, vary in length from a few inches to ljft, and are from 

 lin. to 2in. broad ; they are narrowly spear-shaped, their greatest width 

 being above their middle, so that they are gradually narrowed downwards 

 for more than half their length. The pinnae (leaflets), about fin. long 

 by Jin. broad, are closely set, and so numerous that on a frond of 

 average size as many as forty of them may be found on each side of the 

 midrib. The lower ones are triangular, having the upper and lower sides 



Fig. 68. Asp id iu in Lone hit is 

 (reduced). 



