STUDIES ON THE VEGETATION OF ICELAND 17 
TABLE 3. The Biological Spectra of Iceland. 
A j 
Ghi te Ho) GPE Tb 
MI 
v 
À | 
> 
1200 m..............0.. 387 1,2 (444 74| » | 3.7 
et Eee 20 » | 20] » | 50.0 | 40.0 110.0! »| » 
ST AR | 28 | 3.7| 27 | » | 40.7 | 519 | 7.4) >| >» 
nie | 26 >| 26 RE 42.3 | 50.0 | 7.7 oh RE 
LL. 65|32| 63) »|365 | 460 |127| 16 | 32 
2 TT MERE | 9ı|22| 89) > | 29.2 | 53.9 |112| 34 | 22 
ee SS ESSEN Fe ae | 1172 | 4.5) 112 | 0» ES 56.30) 89|54| 45 
Ra LKR | 161 | 5.2 | 153 | 0.7 | 21.6 | 54.9 |12.4| 5.2 | 52 
us | 204 | 7.9 | 189 | 1.1 | 20.1 | 51.9 | 12.2] 5.8 | 9.0 
EMEA 126 | 5.0 | 120 | 0.8 | 25.0 | 50.0 | 12.5| 7.5 | 42 
LS 166 :| 7.8 | 154 | 0.6 | 24.0 | 46.1 | 13.6| 6.5 | 9.2 
nd... 272 | 6.3 | 256 | 0.8 | 18.0 | 512 | 12.5| 7.4 | 10.2 
Den Iceland. .....:1..... >. 331 | 7.5 | 308 |-1.0 | 16.6 | 52.3 | 11.0 | 9.1 | 10.1 
rene | 277 | 8.2 | 256 | 0.8 | 16.0 | 53.9 | 12.5 | 6.6 | 10.2 
re | 314 | 8.3 | 290 | 0.7 | 15.2 | 51.4 | 11.4] 9.3 | 12.1 
SE 337 SR SEN | 309 | 6.2 | 291 | 1.0 | 15.1 | 52.2 | 11.3| 8.9 | 11.3 
The Highland tracts 8—1200.. | 40 |52 | 38 |.» | 34.2 | 52.6|105| »| 2.6 
= = — 3— 800.. | 224 | 7.7 | 208 | 1.0 | 21.2 | 52.9 11553 | 8.2 
The whole of Iceland ........ 375 | 7.4 | 349 | 1.1 | 15.2 | 52.4 | 10.6 | 9.2 | 11.5 
The Highland tracts 8—-1200 . | 102 | 2.0 | 100 | » | 44.0 | 47.0 | 8.0| >» | 1.0 
— — — 3— 800.. | 638 | 5.3 | 606 | 0.5 | 244 | 53.1 |11.6| 4.8 | 5.6 
The whole of Iceland ........ 11503 | 5.8 |1401 | 0.9 | 16.1 | 52.2 11.7 | 8.2 | 10.8 
of these differences be divided into a lower zone rich in G and HH, 
and an upper zone in which these types grow rarer. Ph are only 
sparingly represented in the lowest zones. Ch are of the greatest 
interest. In the lowest zone, between 300 and 400 m, the Ch per- 
centage is 20.1; in the next, 21.6, and henceforth there is a marked 
increase 25.0--29.2—36.5, until, in the zones above the 800 m curve, 
we get a Ch percentage varying between 40 and 50 for the individual 
zones. For the whole highland tract the Ch percentage is 21.2. 
By means of the life forms it is thus possible to divide the 
highland tracts of Iceland into zones delimited and characterised 
by the percentage content of the individual life forms. It must, 
however, be reserved for future and more thorough-going investi- 
gations to do this as also to draw a comparison between the Ice- 
landic zones on the one hand, and the Scandinavian and Alpine 
The Botany of Iceland, Vol. HI, 2 
