149 
of the carpogonium begin the sterile cells in the carpogenie filament and the 
nearest-lying cells in the supporting filament give off branches forming an involucre 
round the young cystocarp. The ripe cystocarp is a somewhal flattened capitulum, 
the filaments of which radiate outwards and to the sides. 
All the specimens examined were monoecious. The largest specimens were 
57 cm. long. 
The species has only been found on the Skagerak coast, either washed ashore 
or in a seine, and no certain information can therefore be given as to the condi- 
tions under which it occurs. At Skagen I took it in a seine fishing in ca.7 to 9 
meters depth, and at Lokken I found it on the beach attached to Lithothamnia 
washed ashore. Probably it grows near the land in relatively small depths. It has 
only been met with in August and the beginning of September. 
Localities. Sk: Tværsted (M. L. Mortensen), washed ashore; Løkken; 2 miles W. of Skagen, on 
the beach (Caroline Rosenberg Sept. 1st 1859); in a seine off the Marine Hotel on Skagens Gren, 7—9 met. 
Helminthora J. Agardh. 
1. Helminthora divaricata (Ag.) J. Agardh. 
J. Agardh Spec. IJ p. 416, III p. 507; Bornet et Thuret, Féc. Flor. p. 142 PI. 11 fig. 7; Janczewski (1877) 
p.114 Pl. 3 fig. 4—6; Thuret, Etudes phycolog. p. 63 PI. 32. 
Mesogloia divaricata Ag. Syst. Alg. p. 51. 
Mesogloia Hornemanni Suhr, Flora Dan. tab. 2202 (?). 
Of this species, which is easily recognizable from the two foregoing species 
by its distinctly limited inner axis giving off the assimilative filaments, I have only 
had very little material from Danish waters; I shall therefore content myself with 
referring to the above quoted works, in particular those of JAnczEwSskI and THURET. 
The species has only been found in one locality and was represented only 
by two slightly developed specimens; the largest measuring 5,5 cm. in length was 
not much branched and bore numerous antheridia. They both grew on Polyides 
rotundus!. i 
Locality. Kn: TL, W. of Nordre Rønner, 4—5,5 meters, September. 
Fam. 3. Chætangiaceæ. 
Scinaia Bivona. 
1. Scinaia furcellata (Turn.) Biv. 
J. Agardh Spec. I, p. 422, II p. 512; Bornet et Thuret, Not. alg. I p.18, Pl. VI; Schmitz, Befrucht. 1883, 
p. 15, Taf. V fig. 5—7; Schmitz and Hauptfleisch, Rhodophyc. p. 337; Oltmanns, Morph. I p. 556. 
Ulva furcellata Turner in Schrader, Journal für Botanik 1800 p. 301. 
Ginnania furcellata (Turn.) Mont.; Harvey, Phye. Brit. Pl. 69. 
7 When the printing of this paper was almost finished, L. Kurssanow has published interesting 
investigations on the cytology of the three last-named genera of Helminthocladiaceæ (Beiträge zur Cy- 
tologie der Florideen. Flora 99. Bd., 4. Heft 1909, p. 311), but further reference could not be made to 
them here. 
