STUDIES ON THE VEGETATION OF ICELAND 1595 
TABLE 30. The Distribution of Species Groups and Life 
Forms in the Scale of Snow Covering. 
1. Björk. 2. Lyngdalur. 3. Thrasaborgir. 4. Leekjamot. 
5. Nordtunga. 6. Arnarvatnsheidi. 7. Average. 
2 |e) 28) A| E|A3/A2 ALEA ESE2|EI Ph. Ch| H| G HH|Th 
5 2% As | 
la 4536 | 29 |11.452|48|30 11 11], 30) 11) 5 | 2 | » |28 | 56 | 16 
b 4096 | 30 |13.6/33|67|18| 9 | 6 |33 13/21 0.3| » |39 47 14 0.2 
| ~ _ — | — — — 
fa 2a... |1228| 9 | 24/75/2555 18| 2 |2ı| ı 4 | » |» |10/41 as 
Ib b... | 3852 | 18 | 5.560 4013619] 5 |30|10| 1 10.2" » [43 | 39 | 18 
(atl) ce... | 860 | 27 | 8.6/57|4335|14| 7 |27/10| 6 | » | » | 23) 51) 26 0.5 
I d... | 6644 | 34 |13.3|50 | 50 | 29 | 10/11125/14|10| 1 | » | 26/56/17! » |0.3 
HI e...| 7418 | 25 | 10.6] 20/80) 12) 3 | 5 |28 126124) 2 | » 135155 |10| » | » 
Ia 3a... | 1340 | 9 | 22/ 91/9/85) 7 |»|6 >| 3 |»|» 57 8 |35| » | » 
I ob... 1924) 22 9.6158 42 33 16 9 17 17 8 [0.2|| » | 25 | 56 | 18 0.2 
IL c... | 2064 | 31 |10.3/36|65)22 |11| 3 |21 127/16 0.2] » 13449 ı7| » 02 
Ib 4a ... | 2058 | 27 | 6.9175 265216 7 24 1 | 1 0.2) » |45|47|5] » | 3 
Hb... | 3480 | 39 |17.2164|36 3918| 7 |25| 7 | 4 [0.1] » |35|49|14| » | 2 
ee == u u ar res >= = — | = TE > = = | a 
II 5a... | 1392 | 31 13.948 52/25/15 8 |33| 9 |10| » | » |20/55/16| » |0.3 
Mlb... | 4316 | 43 | 10.830 | 70/14 | 10] 5 27/28 11| 4 | » |17| 70) 14] » | » 
am e 1276 | 23 | 6.4125 75/13/10] 3 17/46/1111] > | 8/75/17! » | » 
Ib 6a … | 4748 || 27 | 7.9/81| 19/55|20| 6 | 19| » | » | » | » 152136 10 >» | 2 
I b... | 5664 | 32 | 11.3) 70| 30||43/24| 3/30) 1 | » | » | » | 48/37/15) » | 1 
HM oc... | 7184 | 35 | 14.41/71) 29] 39} 25] 7 124 4 |» | » | » 3847/15 » [0.3 
HE d... || 3892 | 32 |13.0/44|56|24|13| 7 |21127| 6 | 2 | » 31/53/16! » |0.2 
Ie... || 2000 | 21 |10.048|52|34|13| 1 |24|23| 5 | » | » | 35/43/22] » | » 
rar 9 SEIFERT | 
7. Ia... | 2568 | 9 | 2.3/83/ 17/70) 13| 1 |14| 1 | 4 » |» |27/ 40/33] » | » 
Ib ... 10.658] 24 | 6.872 2848| 18| 6 |24 4 0.5lo.1]» 47/41/11] » | 2 
II ... 26.288 || 32 |13.3\60!40\35|18| 9 |26| 9 | 5 10.2! » 3415016 » | 1 
II ... 20:966 | 29 | 10.2 | 34 | 66 | 20 | 10 | 4 |23,30|12 11.5 |» 27/58 16| » 01 
versed, this group occurs in greatest quantity on soil with a con- 
stant snow-covering, while the Th group behaves like Ch. 
If instead of the values for frequency we use the species number 
alone, the result will be the same. The Th percentage for snowbare 
soil, soil with a normal snow-covering, and soil with a constant snow- 
covering at Vestfirdir, calculated from Ingimar Oskarsson’s spe- 
cies lists, is respectively 37, 24, and 20. 
Hence the following rule applies to the distribution of the life- 
forms in the Icelandic scale of snow-covering. On the most 
