KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 131 



Remark on the species. This plant, as I understand it here, is identical with that 

 distributed by Aheschoug 1. c. Neither Lyngbye's, nor J. G. Agabdh's, nor even Aee- 

 SCHOUg's, descriptions and diagnoses of Chantransia (Callithantnion) secundata agree very 

 well with that alga, and it is doubtful, 1 think, whether it is really identical with 

 Lyngbye's Callithamnion Daviesii /i secundatum. This is differently understood by 

 different authors, the short description and incomplete figure furnished by Lyngbye 

 easily giving rise to different explanations ^). 



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

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

 are not well fit for a closer investigation. 



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

 Porphyra laciniata. On the west coast of Novaya Zemlya I have found it within the 

 sublitoral zone, attached to Odonthalia 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 widely distri- 

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

 is Rogatshew Bay on the west coast of Novaya Zemlya, Lat. N. 71° 23'. 



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



The Murman Sea: Rogatshew Bay, rare. 



Fam. DELESSERIACEiE J. G. Ag. 



Epicr. p. 444. Cfr. Alg. med. p. 155. 



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



Epicr. p. 477; Lamouh. Ess. p. 122; ex parte. 



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



Spec. Alg. 2, p. 685. Gigartina purpurascens y rostrata Lyngb. Hydr. Dan. p. 46. 



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

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



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



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

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

 of Vahl on the label affixed to them, they have been collected in March and were 

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

 this species. 



1) Parlow's Trentepohlia virgatula var. secundata. New. Engl. Alg., p. 109 is probably not Callithamnion Da- 

 viesii ,S seeufidatum Lyngb., but C. luxurians J. G. Ag., Ktjtz., Trentepohlia virgatula Aresch. 



