260 87. FiLiCES. 



Arctic region. Midarctic — Sujierarctic zones. 



Descends to 900 yards, less or more. 



Ascends to 1200 yards, more or less. 



Range of mean annual temperature 38 — 35. 



Native. Rupestral. Extremely local, according to our 

 present knowledge of its distribution. First found in 

 Scotland by Mr. William "Wilson, " at the station of Saxi- 

 fraga rivularis on Ben Lawers." Subsequently it was 

 discovered on another mountain some miles westward of 

 Ben Lawers, between Glen Dochart and Glen Lochay. 

 Mr. Borrer describes this latter station as " Corrach dh' 

 Ouffillacli," a corrie on a hill called Mael Ouffillach. But 

 Mr. GourHe, the discoverer of the fern there in 1841, calls 

 the corrie " Corrach Uachdar." Professor Arnott writes 

 it, " Corrah dhu Cuachdar, sometimes called Corrach- 

 uachdar ", and the adjoining mountain " Meal-cuachlar ". 

 Mr. Gourlie supposes the altitude to be somewhere between 

 2500 and 3000 feet ; Professor Arnott says about 3000 

 feet. Hence the intermediate height of 900 yards, or 

 2700 feet, is indicated above. I suppose the station on 

 Ben Lawers to be more elevated, but have not seen the 

 place where Saxifraga rivularis grows on that mountain. 

 For the supposed or suggested habitat of Wales, see Phy- 

 tologist, i. 875. 



1382. AsPIDIUM LONCHITIS, Sw. 



Area * * * [4 * 6] 7 -* * 10 11 [12 13] * 15 16 17 [18]. 



South limit in Caernarvon, York. 



North limit in Sutherland. [Orkney ?] 



Estimate of provinces 6. Estimate of counties 15. 



Latitude 53 — 59. Highland type of distribution. 



A. A. regions. Superagrarian — Superarctic zones. 



