KONGL. ÖV. VET. AKADEMIENS HANDLING AK. BAND. 20. N:0 5. 131 



Eeinark on the species. This plant, as I uuderstand it here, ia ideutical vvitli that 

 distributed by Akeöciioug 1. c. Neither Lyngbye's, nor J. G. Agakdus, iior even Ake- 

 SCHuug'ö, descriptiona and diagnoses of Chantransia (Callithaninion) secundata agree very 

 well with that alga, and it is doubtful, I think, whether it is really identical with 

 Lyngbye's Callithamnion Daviesii [^ secandahun. This is differently understood by 

 ditferent aiithors, the short description and incoinplete figure furnishcd by Lyngbye 

 easily giving rise to diöerent explanations '). 



I shall give a description of the Scandinavian Chantransia secundata at another 

 tiine, when I have had an opportunity of examining living individuals. Dried specimens 

 are not well fit for a closer investigation. 



Hahitat. On the coast of Norway the present alga is litoral, growing chiefly on 

 Porphyra laciniata. On the west coast of Novaya Zenilya I have foiind it within the 

 sublitoral zone, attached to Odonthatia dentata. It has been collected with spores in 

 the Polar Sea in July and August. 



Geogr. Distrib. It belongs both to the Atlantic and the arctic region of the Polar 

 Sea, but in the latter is only little spread. Nor does it seem to be more vvidely distri- 

 buted or particularly abundant within the former region. Its most northerly locality 

 is Rogatshew Bay on the west coast of Novaya Zenilya, Lat. N. 71° 2o'. 



Localities: The Norwegian Polar Sea: Nordlanden, pretty conimon. 



The Murman Sea: Rogatshew Bay, rare. 



Fam. DELESSERIACEiE J. G. Ag. 



Epicr. p. 444. Cfr. Alg. miid. p. 155. 



Gen. Delesseria (Lamouk.) J. G. Ag. 



Epicr. p. 477; Lamour. Ess. p. 122; ex purte. 



Delesseria rostrata (Lyniib.) J. G. Ag. 



Spec. Alg. 2, p. 685. Gigiirtinu purpurasceus y rostrata Lyngb. Hydr. Dan. p. 46. 



Dencr. Delesseria rostrata J. G. Ag. Spec. Alg. 2, p. 685. 

 Fig. Gigartiua purpurascens y rostrata Lyngb. 1. c. t. 12 B. 



Syn. Gigartina Fabrieiaua Lyngb. 1. c. p. 48, t. 11, D. Cfr. J. G. Ag. 1. c. p. 698. 



Hahitat: In the collection of Greenland alga; at the Copenhagen Museum there 

 are some specimens of this alga with sporocarps and tetrasporangia. By tlie statement 

 of Vahl on the label affixed to thein, they have been collected in March and wcre 

 found attached »ad saxa maritima». Besides this, I know nothing about the hahitat of 

 this species. 



') F.\llLOw's Trentepohlia viryalula var. secundata, New. Engl. Alg., p. 109 is probably not Callithamnion Da- 

 viesii jj secundatum Lyngb., but C. luxurians J. G. Ag., Kutz., Trcuiepohiia viryatula Auescu. 



