ALPINE FLOKA AND FERNS OF NORWAY. 313 



EQUISETACE.E. 



EQUISETUM ARVENSE, L. ; Fl. D. tab. 2,001. Occasional in 

 moist places, on clayey soil, over the whole Fjeld. It mounts 

 very high up, and is found on the banks of streams up to the 

 limit of the larger willows. A variety, E. alpestre (Wahl., Fl. 

 D. tab. 1,942), of more delicate growth than the former, is found 

 even at higher altitudes. 



E. SYLVATICUM, L. ; Fl. D. tab. 1,182. In Drivdal, to the 

 same height as E. ARVENSE. A variety, /3 capfllare, has been 

 noticed near Kongsvold. 



E. UMBEOSUM, Willd. ; Fl. D. tab. 1,780. In Drivdal, at same 

 altitude as the last. 



E. PALUSTRE, L. ; Fl. D. tab. 1,183. Occasional over the 

 whole Fjeld, on moist and swampy places about the birch-limit. 

 A variety, E. tenellum, grows near Jerkin and Kongsvold. 



E. HYEMALE, L. ; Fl. D. tab. 1,409. Occasional on rather 

 damp, sandy, or peaty soil, up to about the birch-limit. Grows 

 near Kongsvold, Jerkin, and in Drivdal. 



E. VARIEGATUM, Willd. ; Fl. D. tab. 2,490. Occasional up to 

 and even above the birch-limit e.g., near Jerkin, Kongsvold, 

 and in Drivdal. It is often washed down by the rivers, and 

 may -be found on the banks of the Miosen, only 400 feet above 

 the sea. 



E. SCIRPOIDES, Willd. Common nearly up to the limit of 

 snow. This, too, is frequently washed down by the rivers. 

 Professor Blytt differs in opinion from Hook and Wahlenberg, 

 who held that the two last forms were one and the same. 

 " E. scirpoides," he adds, " is a genuine Norse growth, and, 

 as far as 1 know, has never been found in S. Europe ; neither 

 in our own country is it found at such low altitudes as E. va- 

 riegatum." 



E. LIMOSCM, L.; Fl. D. tab. 1,184. In a tarn between great 

 and little Nystubajk. A more delicate, less branched form has 

 been found in the easternmost lake in Hviddal, and in a tarn by 

 the roadside between Jerkin and Jerkin-Sseter. 



FILICES. 



POLYPODIUM VULGARE, L. ; Fl. D. tab. 1,060. Grows on walls, 

 stone fences, rocks, and in fissures. Common up to E. Finmark. 

 Found on the mountains up to, and sometimes above, the birch- 



