The Botany of Iceland - 01.12.1945, Side 36

378
STEINDÓR STEINDÓRSSON
schaften der Erde” as used for East Greenland by Böcher (1933,
P- 23).
Steindórsson Molholm Hansen
Böcher
Aquatic vegetation
Flói vegetation Flói-Fén
Mýri vegetation Mýri
Jaðar vegetation Jaðar
Flá
Runnaheiði (shrub heath) Mó, Valllendi
Valllendi (grass field) Valllendi
Brekkur veg. (li veg.) Geiri (partim)
Snjódæld (snow-patch) Geiri (partim)
Mosaþemba (Grimmia heath) Mosaþemba
Flag veg. (clay flat veg.) Flag
Melur veg. (gravel flat veg.) Melur
Sandur veg. (sand vegetation)
Moraine vegetation
Submersiherbosa
Emersiherbosa
do
do?
Aestifruticeta
Altherbosa
Sempervirentiherbosa II
do. and partim I
Frigorideserta
do
The statistic investigation was carried out according to C. R a u n-
k i æ r’s method, thus in each analysis (series of circles) I took 10
sample plots (circles). I shall not here enter into a discussion about
the necessary number of circles in each analysis, but I think that ten
will give a sufficiently accurate result, at any rate in the formations
of the highland, as in all the Icelandic formations altogether. It may,
of course, be urged that the difference between the rarest and the
commonest species does not appear quite clearly when a greater number
of sample plots are not taken, and that in many associations some few
species fall outside the circles. To remedy this to some extent I have
in several cases made notes on the degree of covering of the species.
I am of opinion that precisely R a u n k i æ r’s circling method combined
with an estimate of the degree of covering of the individual species
would be highly desirable and would yield the best results. That this
method has not been adopted in my work, is due solely to the fact
that during the first years I had not yet arrived at this point of view,
and I did not think it convenient to use two methods of investigation
in the same work.