149 



of llie carpogonium begin the sterile cells in tlie carpogenic liiament and the 

 nearest-lying cells in the supporting filament give oil' branches lornnng an involucre 

 round the young cystocarp. The ripe cystocarp is a somewhat 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 Lithothainnia 

 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: Tvtersted i M. L. Mortensen), wa.slied asliore; Lakken; '2 iniles W. of Skageii, on 

 tlie beacli (Caroline Rosenberg Sept. I'-t 1859); in a seine otT the Marine Hotel on Skagens Gren, 7—!) met. 



Helminthora J. Agardh. 

 1. Helminthora divaricata (Ag.) J. Agardh. 



J. Agardh Spec. II p. 416, III p. 507; Bornet et Thuret, Fee. Flor. p. 142 PI. 11 fig. 7; .lanczewski (1877) 



p. 114 PI. 3 flg. 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 Janczewski 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 

 rotiindus 



Locality. Kn: TL, W. of Nordre Renner, 4- 5,5 meters, September. 



Fam. 3. Chaetangiacese. 

 Scinaia Bivona. 

 1. Ncinaia furcellata (Turn.) Biv. 



J. Agardh Spec. I, p. 422, II p. 512; Bornet et Thuret, Not. alg. I p. 18, PI. VI; Schmitz, Befrueht. 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 fiir Botanik 1800 p. 301. 

 Ginnania furcellata (Turn.) Mont.; Harvey, Phyc. Brit. PI. 69. 



' When the printing of this paper was almost finished, L. Kuhssanow has imblislied interesting 

 investigations on the cytology of the three last-named genera of Helminthocladiaceie (Beitrage zur Cj'- 

 tologie der Florideen. Flora 99. Bd. , 4. Heft 1909, p. 311), but further reference could not be made to 

 them liere. 



