288 KJELLMAN, THE ALG^ OF THE ARCTIC SEA. 



f. attenuata Ahln. 

 1. c. p. 20. 



Descr. Enteromorpha iutestinalis b attenuata Ahln. 1. c. 



Exsicc. » » var. » Wittr. et Noedst. Alg. exsiec. N:o 136. 



» » f. longissiraa Aresch. Alg. Scand. exsicc. N:o 327. 



f. cornucopice Ltngb. 



Scytosiphon intestinalis y eornuoopise Lyngb. Hydr. Dan. p. 67. 

 Descr. Enteromorpha intestinalis c cornucopiiie Ahln. 1. c. p. 21. 



Exsicc. » » var. » Wittr. et Nordst. Alg. exsicc. N:o 137. 



Syn. Enteromorpha intestinalis Aresch. Phyc. Scand. p. 415. 



» » DiCKiE, Alg. Sutherl. 1, p. 143; ex parte; Alg. Cumberl. p. 239. 



1) » Kleen, Nordl. Alg. p. 40. 



Ulva compressa Wg. Fl. Lapp. p. 508; ex parte. 

 » intestinalis Gunn. Fl. Norv. 2, p. 120. 

 » » SOMMERF. 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 Ahlner. Of f. genuina I have seen 

 two variations, the one most nearly coinciding with N:o 122 in Aresch. Alg. Scaud. 

 exsicc., though broader than this and more abruptly constricted at the base, the other 

 surely identical with E. intestinalis, s. mesentericeformis Kutz, (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 påle yellow-green colour, which 

 resembles N:o 36 a in Wittk. et Nordst. 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 

 Enteromorphce., difters not inconsiderably from f. attenuata, but is nevertheless most 

 closely allied to this form. Specimens of f. cornucojnce from the Arctic Sea resemble 

 N:o 137 a in Wittr. et Nordst. Alg. exsicc. 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 

 algse 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. 



Geoc/r. Distrib. This species exists with certainty in the Norwegian Polar Sea. 

 I have also seen an Enteromorpha from Baflin Bay which I think ought to be referred 

 to this species. In the White Sea typical E. intestinalis is not to be found, according 

 to GoBi. It is possible however that f. attenuata exists here; but without having access 

 to a greater number of specimens I dåre not decide this question. The E. intestinalis 

 reported from other parts of the Arctic Sea appears to me to belong to other species, 



