KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 121 



Forma Kiltzingii appears to have grown in narrow, densely overgrown rock-pools within 

 the litoral zone, rich in Mytilus edulis and shells. Whether Agardh by his Hutcliinsia 

 Brodicei typica has really meant the beautiful alga distributed by Areschoug in Alg. 

 Scand. exsicc. N:o 64 under the name of Polysiplionia penicillata^ is a question I must 

 leave undecided at present. However, his diagnosis accords well with this form. Se- 

 veral specimens from the Polar Sea belong evidently to P. peniciUata Aresch. That 

 this cannot well be regarded as one of the other forras in a youiig condition, appears 

 to be proved by its being profusely fructiferous. 



The form named by me f. Lyngbyei cc läxa, which is most probably to be con- 

 sidered as the typical P. Brodicei, is well represented by the quoted figure in Lyngbye. 

 Near it stånds a more robust form with dense dusters of branches that are confluent 

 upwards. I have found this form on the west coast of Sweden in open places exposed 

 to a heavy surge. 



Hahitat. According to Kleen, this alga occurs in the southern part of the Nor- 

 wegian Polar Sea on exposed coasts in rock-pools within the litoral zone, but it was 

 not to be found in the interiör of the large bay, Saltenfjord, investigated by him. It 

 seeras thus to be a pelagic form. It possibly grows here, as farther to the south, 

 pretty gregarious in large masses. Kleen says nothing on this point. On the coast of 

 Nordlanden it bears sporangia in July and August. 



Geogr. Distrib. It is known only from the Atlantic region of the Polar Sea, and 

 exclusively from its southern part. 



Locality: The Norwegian Polar Sea: at Nordlanden pretty common. 



Polysiphonia fibrillosa (Dillw.) Grev. 



in IIooK. Brit. T^l. 2, p. 334; Conferva iibrillosa Dillw. Brit. Coiif. p, 86. 

 Descr. Polysiphonia fibrillosa J. G. Ag. Spec. Alg. 2, p. 991. 

 Fig. I' lasiotricha Kiitz. Phyc. gener. t. 49. 



Si/7i. Polysiphonia violacea Kleen, Nordl. Alg. p. 13. 



Remark on the determination of tlte species. The plant recorded by Kleen in his 

 work on the alga3 of Nordlanden under the name of P. violacea, judging by the spe- 

 cimens in his herbarium, is not that species, but P. fibrillosa. It differs certainly by 

 the richer branching, less strongly developed cortical layer, and greater flaccidity, from 

 English specimens of this plant, but still it agrees with these in the main. It comes 

 nearest to the P. laciotricha iigured by Kutzing 1. c, which according to J. G. Agardh 

 ought to be identified with P. fibrillosa. The difference exhibited by the specimens 

 from Nordlanden as compared with the English, depends probably on the former having 

 grown in deep water, while on the coasts of England the plant is litoral. 



Habitat. It has been found in the Polar Sea in several fathoms water, attached 

 to shells, or dead parts of Fucus, or to Desmarestia aculeata, and bearing tetraspores in 

 the month of August. 



Geogr. Distrib. It is known only from the southern part of the Atlantic region 

 of the Polar Sea. 



K. Vet. Akart. HaBdl. Bd 20. N:o •■;. 16 



