266 87. FILICES. 



1387. Lastrea cristata, Presl. 



Ai-ea [1 * 3] 4 [5] * * 8 9 [10 * * ^ * 15]. 



South limit in Suffolk, Norfolk. 



North limit in Nottingham, Chester. 



Estimate of provinces 3. Estimate of counties 4. 



Latitude 5S — 54. Local type of distribution. 



Agrarian region. Laferagrarian — Midagrarian zones. 



Descends to the coast level, in Ouse. 



Ascends to 100 yards, less or more. 



Bange of mean annual temperatui'e 48 — 47. 



Native. Uliginal. Certainly known only in the four 

 counties above mentioned for its limits. Has been re- 

 ported from various other counties also, upon unsafe 

 authority, or unintentionally through appljang the name 

 "cristatum" to other ferns. Li May 1851, Mr. F. J. 

 A. Hort favoured me with some notes and locaHties, for 

 use in this work, and among which I find the following 

 IDassage, well deserving the attention of botanists who may 

 have the opj)ortunity of examining a series of L. cristata 

 in its natural stations : — " I cannot believe L. cristata to 

 be more than a state of L. spinosa. The general cha- 

 racter and texture of both agree together, and are quite 

 unlike those of L. multiflora. Those who have seen it 

 growing speak of the plane of each pinna being nearly 

 vertical to that of the general frond, which is not the case 

 in L. spinosa. But I have seen precisely the same condi- 

 tion in L. multiflora (concurrent with other modifications) 

 in boggy soil, vmder particular circumstances." 



