293 87. FiLiCES. 



1411. Ophioglossum vulgatum, Linn. 



Area 1 2 3 4 5 * 7 8 9 10 11 12 13 14 15 16 * 18. 



South limit in Cornwall, Isle of Wight, Kent. 



North limit in Shetland, Orkney? 



Estimate of provinces 17. Estimate of counties 70. 



Latitude 50 — 61. British type of distribution. 



Agrarian region. Inferagrarian — Superagrarian zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 100 or 200 yards, in England. 



Range of mean annual temi^erature 51 — 45. 



Native. Pratal, Pascual. Ascertained only in about 

 50 counties ; and it would thus appear somewhat rarer 

 than the Botrychium. But the latter is perhaps more 

 usually recorded, if observed ; because it grows more 

 away from the inhabited tracts than the Ophiogiossum, 

 and thus api^ears a greater rarity to collectors. Again, the 

 Ophiogiossum is more liable to be overlooked among grass 

 and other herbage, than are the divided fronds of the 

 Botrychium. The census of their distribution is in the 

 opposite direction ; the Ophiogiossum decreasing in fre- 

 quency northwai'd, the Botrychium decreasing southward. 



Onoclea sensibilis, Linn. 



Area (9 10). 



Alien. Said to have been found near Warrington and 

 in the north of Yorkshire (Phytologist i. 492). I think 

 some other locality has been published, but do not recol- 

 lect where. The fern is a native of North America. 



