ALPINE FLORA AND FERNS OF NORWAY. 313 
EQUISETACEZ, 
EQUuISETUM 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, H. alpestre (Wahl. Fl. 
D. tab. 1,942), of more delicate growth than the former, is found 
even at higher altitudes. 
KE. sytvaticum, L.; Fl. D. tab. 1,182—In Drivdal, to the 
same height as E. ArvensE. <A variety, 8 capillare, has been 
neticed near Kongsvold. . 
E. umprosum, Willd.; Fl. D. tab. 1,780.—In Drivdal, at same 
altitude as the last. 
E. pauustre, L.; Fl. D. tab. 1,1838.—Occasional over the 
whole Fjeld, on moist and swampy places about the birch-limit. 
A variety, Z. 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. variecatum, Willd.; Fl. D. tab. 2,490.—Occasional up to 
and even above the birch-limit—eg., near Jerkin, Kongsvold, 
and in Drivdal. It is often washed down by the rivers, and 
may be found on the banks of the Midsen, only 400 feet above 
the sea. 
E. scirporpEs, 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 §. Europe; neither 
in our own country is it found at such low altitudes as Z. va- 
riegatum.” 
E. trmosum, L.; FI. D. tab. 1,184.—In a tarn between great 
and little Nystubek. 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-Seter. 
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- 
