THE MARINE ALG OF THE SHETLANDS 801 
where I, consequently, again had an opportunity of examinin 
fongh briefly — another sheltered locality, and then we left the 
i 
I had been particularly anxious to compare the Fucus-vegetation 
of the two archipelagoes. It is strange that Fucus serratus does not 
occur in the Ferdes, as it is found in Iceland, and is very — 
on the west coast of Norway and also in the Shetlands. F. i 
flatus, on the other hand, is very common in the Ferées as well a 
in Iceland, and on the north coast of Norway,* and therefore I 
supposed that this alga was to be found in the Shetlands also. This 
supposition was strengthened by my finding it growing abundantly 
on stones in Lerwick Harbour, but in spite of a very close search 
I did not find it in any other place, neither east of Lerwick outside 
the fjord, nor on Bressay, apo: I visited some islets and a larger 
sheltered bay behind them, nor in Burra Voe. I also searched in 
ain for EF’, inflatus f£. disticha (L. ) ‘Borges, on Muckle Holm, though 
. @ similar locality in the Ferées this form would snobs 
have been met with, as being characteristic of the exposed coast 
the latter place. J udging nae the above, I do not think that P. 
inflatus can be very common in the Shetlands. 
Regarding the algal vegetation of the sheltered localities here, 
as elsewhere, the Fucacee occurring between tide-marks charac- 
terize the vegetation. On ie: gabon mentioned rocks opposite 
Lerwick on Bressay I found Porphyra umbilicalis on the side of the 
rocks facing the fjord, slightly above as well as slightly below high- 
water mark, in the latter place intermixed with Pelvetia canaliculata; 
ond below this Fucus spiralis was met with, and then F’. eran 
d below this F’. serratus, which grows slightly above and 
high- water mark. On the side of the rocks facing the aeall 
sheltered bay I found Pelvetia canaliculata growing uppermost, 
w that Fucus spiralis, then Ascophyllum nodosum (with Poly- 
1 low ese, near low- 
rratus ; below the latter Silswed again the usual 
cceteit 3 
very interesting Will discovered the alga in Svictioniabond 
CA ya ‘ Einige a ee Drébak,”” Botaniska Notiser, 1898, 
117). 
