Rit (Vísindafélag Íslendinga) - 01.06.1975, Blaðsíða 51

I have not been able to determine the relationship of the C.
Lyngbyei flói with vegetation sociations abroad.
16. Carex Lyngbyei — C. nigra — C. chordorrhiza sociation
(Tab. XV A-B 1-2)
Here there are only two observations both from the Flói, hut
nevertheless I have examined this sociation in many parts of the
country, although it is by no means as widely distributed as so-
ciation no. 17, which is by far the most common sociation in this
association. Apart from the three character species, Comarum
palustre and Menyanthes trifoliata are very conspicuous. Other
species are few and far between. Yet E. angustifolium has a high
frequency count in Analysis no. 2, which best indicates the rela-
tíonship with the Eriophorum flói. In both places the terrain is
very wet, almost no slope. The surface is level, but it may be noted,
that Analysis 1 is made in a hollow, with level, undular forma-
tions on both sides, where E. angustifolium and C. nigra occur. E.
group is here in a clear majority, H and G percentages are vari-
able, but HH percentage is high, all of which are characteristics of
the C. Lyngbyei flói.
17. C. Lyngbyei — C. nigra soeiation
(Tab. V A-B 3-7)
The observations are both from Amessýsla and Rangárvallasýsla,
but this sociation is generally widely distributed throughout the
country wherever C. Lyngbyei flói occurs, and it is only to a very
stíght degree subject to change depending on growth site. C. Lyng-
byei is always dominant both in physiognomy and covering, and
tts vegetation abundance normally surpasses that of all other spe-
cies combined. C. nigra is very changeable, its frequency fluctu-
ates between 20 and 100, but even though it reaches a high fre-
quency it never obtains significant covering, since there is only
one or very few single specimens in each sample plot. Among ac-
companying species Calamagrostis neglecta is most conspicuous and
Ranunculus reptans often occurs. Comarum palustre and Meny-
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