288 KJELLMAN, THE ALGM OF THE ARCTIC SEA. 
f. attenuata AHLN. 
Ils @3 ja AY: 
Descr. Enteromorpha intestinalis 6 attenuata AHLN. |. ce. 
Exsice. » » var.» Wirrr. et Norpst. Alg. exsice. N:o 136. 
» » f. longissima Aregscu. Alg. Scand. exsicc. N:o 327. 
f. cornucopie Lynes. 
Scytosiphon intestinalis y cornucopie Lynes. Hydr. Dan. p. 67. 
Descr. Enteromorpha intestinalis ¢ cornucopie AHLN. |. c. p. 21. 
Exsice. » » var.» Wirrr. et Norpst. Alg. exsicc. N:o 137. 
Syn. Enteromorpha intestinalis Arrscu. Phyc. Scand. p. 415. 
» » Dickir, Alg. Sutherl. 1, p. 143; ex parte; Alg. Cumberl. p. 239. 
» » KEEN, Nordl. Alg. p. 40. 
Ulva compressa We. FI. Lapp. p. 508; ex parte. 
» intestinalis Gunn. Fl. Norv. 2, p. 120. 
» » SomMer?. Suppl. p. 185. 
Remark on the forms of this species. The present species is certainly very rich in 
forms within the Polar Sea, but it appears to me that the forms occurring here may 
be grouped round the three types distinguished by Antner. Of f. genuina I have seen 
two variations, the one most nearly coinciding with N:o 122 in Armscn. Alg. Seand. 
exsicc., though broader than this and more abruptly constricted at the base, the other 
surely identical with . intestinalis, & mesenterieformis Ktrz, (Spec. Alg. p. 478), a 
large form more than half a metre long and even 3 cm. in diameter. It tapers gra- 
dually, but rather much, towards the base and is of a pretty dark grass-green colour. The 
form attenuata is more variable than the typical form. The most characteristic form in 
my collections from Finmarken is a long form of a pale yellow-green colour, which 
resembles N:o 386 a in Wrirrr. et Norpst. Alg. exsicc. To the group of attenuata I have 
referred also a dark green form, more than a foot long by one inch broad, which, 
according to AHLNER who has had the kindness to examine my collections of arctic 
Enteromorphe, differs not inconsiderably from f. attenuata, but is nevertheless most 
closely allied to this form. Specimens of f. cornucopie from the Arctic Sea resemble 
N:o 137 a in Wrrrr. et Norpst. Alg. exsice. but are considerably larger and broader. 
Many of those are 4—5 cm. in diameter upwards. 
Habitat. The present species is litoral, growing gregarious between tide-marks, 
chiefly in rock-pools which are filled with water at low-water. It is attached to other 
ales or to stones, flourishes on exposed as well as sheltered coasts, and even enters 
river-mouths where the water is only little salt. Reproductive organs are developed 
in July, August, and September on the coast of Finmarken. 
Geogr. Distrib. This species exists with certainty in the Norwegian Polar Sea. 
I have also seen an Enteromorpha from Baffin Bay which I think ought to be referred 
to this species. In the White Sea typical HL. intestinalis is not to be found, according 
to Gosi. It is possible however that f. attenuata exists here; but without having access 
to a greater number of specimens I dare not decide this question. The H. intestinalis 
reported from other parts of the Arctic Sea appears to me to belong to other species, 
