KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 259 



Syn. Chorda lomentaria Aresch. Phyo. Scand. p. 365. 

 » » Dickie, Alg. Cumberl. p. 237. 



» » Nyl. et Ssel. Herb. Penn. p. 73. 



Fucus lomentaria Sommerf. Suppl. p. 184. 

 Seytosiphon lomentarius Gobi, Algenfi. Weiss. Meer. p. 68. 

 » " Kleen, Nordl. Alg. p. 39. 



Habitat. This species grows scattered both on exposed and sheltered coasts, attached 

 to rocks within the litoral zone, partly in its lowest part, partly higher up, in the latter 

 case usually in rock-pools. At Nordlanden it is fully developed in June, bearing then 

 so called zoosporangia. Farther northward I have not found specimens with propagative 

 organs until somewhat later in the year, at the end of July. 



Geogr. Distrib. It belongs only to the most southern parts of the Polar Sea. Its 

 maximum of frequency is in the southern portion of the Norwegian Polar Sea. The 

 northernmost point where it has been found is Maaso on the north coast of NorAvay 

 about Lat. N. 71°. 



Localities: The Norwegian Polar Sea: Nordlanden common and abundant; Fin- 

 marken local and very scarce (in July and August) at Maaso. 



The Murman Sea: the coast of Russian Lapland at Sviatoi-Noss. 



Baffin Bay: Cumberland Sound; the west coast of Greenland at Godthaab. In 

 the herbarium of the Copenhague Museum there are specimens collected by Woumskiold 

 at Greenland, without any notes as to their special locality. 



Seytosiphon attenuatus nob. 



Sc. laxe csespitans, thallo cylindraoeo vel cylindraceo-claviformi, basim versus valde et longe attenuato, 

 5 — 8 cm. alto, diametro usque 1,5 mm., fusco-olivaceo, opaeo, pilis parce vestito; zoosporangiis multilocularibus 

 (gametangiis) conicis, 30 — iO j.i. longis, 15 — 20 fx. crassis, superne liberis cum cellulis obovoideis vel breviter 

 claviformibus subhyalinis, magnis, usque 120 j-i. longis, 55 fi. crassis stratum subcontiguum formantibus. Tab. 

 26 fig. 1—5. 



Syn. Coilonema chordaria f. simpliciuscula Kjellm. Spetsb. Thall. 2, p. 40. 



Description. This plant forms thin clusters. It is attached by a callus radicalis. 

 The most vigorously developed individuals that I have seen have a cylindrical-claviform 

 frond, evenly and considerably tapering towards the base. Their length is 5 — 8 cm. The 

 diameter is 1,5 mm. in the upper part. Other specimens are much narrower, cylindrical 

 with a more narrow base; fig. 1 — 2. The alga is light-brown with an olive-brown tinge, 

 and not shining. The frond is solid in its lowest part at the base, but hollow in the greatest 

 part of its length. Its sterile part as well as that which bears zoosporangia (gametangia) 

 is covered with thin, rather long hairs of the structure common in the Phoeosporacew; 

 fig. 5. The outermost layer of the wall of the frond is composed of cells that are squarish 

 or rectangular in longitudinal section and richly provided with endochrome. The inner 

 part of the wall is formed of cells with little or no endochrome, the outer ones being 

 smaller, the inner ones becoming wider and longer ; fig. 3 — 4. The cortical cells produce 

 zoosporangia (gametangia) and so called paraphyses. The former are narrowly or thickly 



