The Botany of Iceland - 01.12.1916, Page 44

388
ERNST 0STRUP
As regards the universal distribution, it appears froni the above
list, that the Icelandic coastal flora, as far as the Diatoms are con-
cerned, has a predoininant Europeen character, but about one half
of the European species can also occur in colder seas. The list
of the distribution of the Diatoins in the different parts of the coast
shoxvs, that out of 209 species found in the samples, 145 or 69 %
were found in S.W., 101 or 48% in N.W., 92 or 44% in N., 87 or
42 % in S. and 64 or 31 % in E. The Diatom-life therefore is
most abundanl on the South-West coast.
List of the species found in more than 50 samples.
Total 438 samples S. 58 samples S.W. 191 samples N.W. 30 samples N. 98 samples E. 53 samples
Number of samples %> Number of samples %> Number of samples % Number of samples %> Number of samples %> Number of samples %>
Rhabd. arcuat ... 303 69 38 66 126 66 21 70 77 79 36 68
— minut 231 53 34 60 113 59 27 90 42 43 15 28
Hyal. subt. v. scotic 209 48 28 48 110 58 24 80 39 40 7 13
Biddulph. aurit 180 41 14 24 83 43 29 97 34 35 17 32
Syn. aff. -)- var 174 40 13 22 77 40 27 90 50 51 17 32
Coccon. Scutell 160 37 18 31 74 39 15 50 38 39 15 28
Podos. liorm 156 36 24 41 79 41 19 63 17 17 14 26
Grammat. mar 155 35 31 53 98 51 11 37 12 12 3 6
Rlioicosph. curv 143 33 17 29 74 39 16 53 27 28 7 13
Grammat. ang. v. isl 125 29 23 40 61 32 10 33 21 21 10 19
Coccon. cost 119 27 10 17 49 26 18 60 28 29 14 26
Fragil. striat 82 19 12 21 30 16 5 17 13 13 20 38
Gomphon. exig 91 21 15 26 40 21 10 33 16 16 10 19
Melos. sulc 81 18 5 9 61 32 9 30 6 6 0 0
Grammat. ocean. v. min.. 66 15 19 33 38 20 4 13 5 5 0 0
Isthm. nerv 64 15 20 34 24 13 3 10 7 7 7 13
Syn. invest 62 14 17 30 25 13 5 17 8 8 7 13
Grammat. ang 60 14 16 28 34 18 4 13 4 4 2 4
Trach. asp. var. pulch. .. . 51 12 10 17 33 17 3 10 4 4 1 2
Not considering N. W. in the above list, which, owing to the small
number of samples, gives a misleading percentage, it appears, that,
of the frequently occurring species, the following are especially
prominent:
in S. (with more than 50 %): Rhabd. arc. (66 %), Rhabd. minut.
(60 %), Gramtph. marina (53 %).