87. FILICES. 267 



1388. Lastrea Filix-mas, Presl. 



Area general. 



South limit in Cornwall, Isle of Wight, Kent. 



North limit in Shetland, Orkney, Hebrides. 



Estimate of provinces 18. Estimate of counties 82. 



Latitude 50 — 61. British type of distribution. 



A. A. regions. Inferagrarian — Inferarctic zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 500 yards, in East Highlands. 



Range of mean annvial temperature 52 — 41. 



Native. Sylvestral, Eupestral. Quite one of our com- 

 monest and most widely distributed ferns ; but it is rare 

 above the agrarian zone. 



1389. Lasteea rigida, Presl. 



Area ****^***9 10*13. 



South limit in York, Lancaster ? 



North limit in Westmoreland. 



Estimate of provinces 3. Estimate of counties 3. 



Latitude 63 — 55. Local type of distribution. 



Agrarian region. Superagrarian zone. 



Descends to 400 yards, or less. 



Ascends to 500 yards, or upwards. 



Range of mean annual temperature, saj^ 45 — 43. 



Native. Rupestral. I have not seen the stations for 

 this fern, which appear to be half a dozen or more, and all 

 included within a small area, in the approximating por- 

 tions of the counties of Westmoreland, Lancaster, and 

 York ; but whether actually within both of the two former, 



