KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 259 
Syn. Chorda lomentaria Argescu. Phye. Scand. p. 365. 
» » Dickie, Alg. Cumberl. p. 237. 
» » Nyl. et Sel. Herb. Fenn. p. 73. 
Fucus lomentaria Sommerr. Suppl. p. 184. 
Seytosiphon lomentarius Gosr, Algenfl. 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 Maasé on the north coast of Norway 
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 WormsktoLp 
at Greenland, without any notes as to their special locality. 
Scytosiphon attenuatus nob. 
Se. laxe ceespitans, thallo cylindraceo vel cylindraceo-claviformi, basim versus valde et longe attenuato, 
5—8 cm. alto, diametro usque 1,5 mm., fusco-olivaceo, opaco, pilis parce vestito; zoosporangiis multilocularibus 
(gametangiis) conicis, 30—40 w. longis, 15—20 w. crassis, superne liberis cum cellulis obovoideis vel breviter 
claviformibus subhyalinis, magnis, usque 120 «. longis, 55 «. crassis stratum subcontiguum formantibus. Tab. 
26 fig. 1—d. 
Syn. Coilonema chordaria f. simpliciuscula KspLum. 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 Ph@osporacee;: 
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 
