88. PTERIDIOIDES. 297 



Native. Ericetal, Rupestral. A scarce plant iii the 

 four or five first provinces, but so frequent on the moun- 

 tains and moors of Scotland, north of England, and Wales, 

 that it may be accounted the commonest species of its 

 genus in Britain. And it has certainly the widest distri- 

 bution, taking into account its vertical range as well as 

 its horizontal area. I suppose that " Holt and Felthoi-pe," 

 in Norfolk, indicated for this species by Mr. S. P. Wood- 

 ward and older authorities, are but little above the coast 

 level. The altitude of 1440 yards is intended for the 

 summit of Ben-na-muic-dhu, in Aberdeensliii'e. The 

 species occurs also up to 4000 feet on Ben Nevis. The 

 wide area refers this species to the British t^^^e, while its 

 greater frequency on the northern mountains and moors 

 would otherwise connect it with the plants of the High- 

 land type. 



1417. Lycopodium selagin dices, Linn. 



Ai-ea [1] ***** 7 8 9 10 11 12 13 14 15 16 17 18. 



South limit in Caernarvon, Chester, Derby, York. 



North limit in Shetland, Orkney, Hebrides. 



Estimate of provinces 12. Estimate of counties 40. 



Latitude 53 — 61. Highland type of distribution. 



A. A. regions. Midagrarian — Superarctic zones. 



Descends to the coast level, in Mersey. 



Ascends to 1100 yards, in East Highlands. 



Range of mean annual temperature 48 — 36. 



Native. Uliginal, Eupestral. Occurs in neai'ly all the 

 counties of the ten most northerly provinces. For Trent 

 I am still unprepared to adduce any recent verification of 

 the Derbyshire locality, "on Kinderscout ", recorded in 

 the Botanist's Guide, on authority of Mr. O. Simms ; but 

 VOL. III. 2 q 



