The Botany of Iceland - 01.12.1912, Blaðsíða 89

MARINE ALGAL VEGETATION
75
mark. Of the remaining 23 species the greater number will cer-
tainly be found in Finmark. But I think it Iess probable that Om-
phalophyllum nlvaceum and Laminaria fœröensis are to be met with
there, while one can form no opinion as to whether the endemic
Icelandic species (17 and 31) exist in Finmark, as their distribution
outside Iceland is unknown. On the other hand I think it somewhat
probable that the Icelandic Færöese species Myrionema fœröense may
occur in Finmark.
The 27 species, whicli are present in Finmark and absent from
Iceland, are the following: —
Chantransia efflorescens.
C. Daviesii.
Harveyella mirabilis.
Polysiphonia elongata.
Spermothamnion Turneri.
Furcellaria fastigiata.
Polyides rotundus.
Petrocelis Middendorfii.
Phymatolithon investiens.
I.ithothamnion intermedium.
L. fornicatum.
Lithoderma lignicola.
Myrionema foecundum.
Chilionema reptans.
lictocarpus terminalis.
E. nanus.
E. ovatus.
Myriotrichia filiformis.
Sphacelaria racemosa.
S. cirrhosa.
Phæosaecion Collinsii.
Asperococcus echinatus.
Delamarea attenuata.
Dictyosiphon hispidus.
Laminaria Agardhii.
Haplospora globosa.
Halidrys siliquosa.
The majority of these species may be expected to occur on the
coasts of Iceland, but there is less probability of Laminaria Agardhii
being met witli there.
If we turn to E. Iceland and compare this with the White Sea
we obtain the following íigures: —
E. Iceland 80 species
not common
43 (45%)
White Sea 52 species
common not common
37 (39%) 15 (16%)
The floristic similarity is somewhat considerable, and ten of
the species peculiar to the White Sea are known from other parts
of the coast of Iceland. These ten species are Dilsea edulis, Cysto-
clonium purpurascens, Polysiphonia nigrescens, Delesseria alata, Ptilota
plnmosa, Lithothamnion Lenormandi, Corallina officinalis, Dictyo-
siphon hippuroides, Fucus serratus, and Pelvetia canaliculata.
Of these species, however, only an extremely small number
can be expected to occur in E. Iceland.
The five species present in the White Sea and entirely absent
from Iceland are: —