Rit (Vísindafélag Íslendinga) - 01.06.1975, Page 37

then frequently occurs on the one hand on low flat ridges and
ttdres or on terraces in mountain slopes, where water has stag-
nated in the soil. It often lies in the proximity of flói borders, if
Water has stagnated there. The number of species is as elsewhere
limited. The A species enjoy a high ratio, which is in direct con-
junction with the places of growth. Chamæphytes are often found,
whereas geophytes are the dominant hfe-form as applies elsewhere
in flói areas. Nothing specific is to he related about analyses 5-8,
aU of which were made in Melrakkaslétta, beyond what has gen-
erally been stated about the sociation. Analysis no. 9 was made at
an altitude of 200 metres above sea level on the mountain-ridge
above Ánastaðir in Vatnsnes in a wet, level flói tract. There and
m Vatnsnes the Eriophorum flói is rarely seen until this height
above sea level is reached. Analysis no. 10 is from the heath above
Viðvík in Vopnafjörður and it is taken at a similar altitude as no. 9.
The sociation has wide distribution there and elsewhere on Sand-
víkurheiði.
Near Svarfhóll m Geiradalur I have observed this sociation, where
h occmred in a rather unusual manner. Apart from the character
species there occurred the following:
Carex chordorrhiza, C. microglochin, C. rariflora, C. limosa,
C. Halleri, C. panicea, Juncus triglumis, Polygonum vivipartun,
Scirpus cæspitosus, Vaccinium uliginosum. Although none of these
species occurred in significant abundance, it is noteworthy how
many eutrophic species appear there, i.e. C. Halleri, C. microg-
lochin, and C. panicea, but on the other hand the oligotrophic C.
hmosa as well. The presence of the eutrophic species might indi-
Cate that this sociation could occur in rather alkahne soil.
Analysis no. 11 from Laugarholt in Borgarfjörður holds a rather
tmique position. There C. chordorrhiza, C. dioica and C. panicea
°ccur with high frequency, and C. chordorrhiza yields little to the
character species in covering.
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