94 WHERE TO FIND FERNS. 



of Polystichum angidare. The serrated, bristly pinna; 

 are alternate along and on opposite sides of the rachis, 

 and wing-shaped, and are attached to the rachis by their 

 narrowed bases, the upper portion of each pinna next 

 the rachis ordinarily overlapping the base of the pinna 

 next above it; stipes very short and scaly. Fructification 

 usually present only on the upper sides of the fronds, 

 and consisting of rows one on each side of the midvein 

 of each pinna of round sori, covered, when the spore- 

 cases are young, by round indusia. The sori are usually 

 so arranged that they form an acute angle on the under- 

 side of each fruitful pinna, the angle being at the apex 

 of each pinna, the lines which form it widening out 

 towards the base. 



HABITATS. Mostly in localities not less than a thou- 

 sand feet above the sea-level ; in such localities it grows 

 in moist, rocky fissures, and is oftentimes firmly and im- 

 movably wedged into stony crevices. 



WHKRE FOUND. In England, in the counties of 

 Cumberland, Durham, Northumberland, Westmoreland, 

 and York. The particular localities in three of these 

 counties are the following : in Cumberland, at Fairfield, 

 Helvellyn ; in Durham, on the Falcon Glints, Teesdale, 

 some ten miles westward of Middleton, and also on the 

 Mazebeck Scar ; in the county of York, on Attermire 

 Scar ; in the neighbourhoods of Giggleswick and Ingle- 

 borough, and (near Settle) at Langcliffe. In Wales, in 

 Caernarvon, Glamorgan, and Merioneth. In Caernarvon, 

 the neighbourhoods of Clogwyn-y-garnedd, of Cwm- 

 Idwal, of Glyder-Vawr, and of Twll-du. In Merioneth, 

 it has been found (on Cader Idris) by Mr. Franklin T. 

 Richards. In Scutland, in the counties of Aberdeen, 

 Argyle, Banff, Caithness, Dumbarton, Elgin, Forfar, 

 Inverness, Orkney, Perth, Ross, Stirling, and Suther- 

 land ; also in the Isle of Mull, on Ben More. The 

 special localities of some of these countries are these : 

 in the county of Forfar, on the Clova Mountains, Can- 



