386 



mining the specimens in his herbarium. With regard to its habitat 

 Lyngbye writes: — »Ad insulas Færoenses in stipite Laminariæ 

 digitatæ inter cæspites Callithamnii Rothii inveni, rarius«. 



The greater part of the specimens which I examined were sterile, 

 in June only I found specimens bearing ripe tetraspores. 



Does not appear to be common. Ost.: Fuglefjord (!), Molen (!); Str.: 

 Between Thorshavn and Hojvig (Lyngb.); San do: Skopen (!); Syd.: Tran- 

 gisvaag (Rosenvinge). 



58. A. Plumula (Ellis) Thur. Rosenv., Grønl. Havalg., p. 786; 

 Callithamnion Plumula Lyngb., Hydrophyt., p. 127. 



Main form. 



var. boreale Gobi, Algenfl. des weiss. Meeres, p. 47; Antitham- 

 nion boreale Kjellm., N. I., p. 226 (180), tab. 16, figs. 2—3. 

 f. corallina Rupr. Kjellm., N. I., tab. 16, figs. 4—5. 



Fig. 59. Antithamnion Plumula p boreale {.corallina (Rupr.). 60:1. 

 Portion of a filament with tetraspores and glands. 



Besides the main form I found the above-mentioned variety 

 and form; I follow Rosenvinge in regarding these as forms be- 

 longing to this species. 



The specimens re ferred to var. boreale agreed fairly well with 

 Kjellman's figures, but sometimes the tetrasporangia had a uni- 

 cellular stalk. The specimens bear quantities of glands (cfr. Rosenv., 

 Grønl. Havalg., p. 788). 



I have figured (fig. 59) a small portion of one of the specimens 

 which are referred to formå corallina, as they differ somewhat from 

 Kjellman's ligures; the branches of the second order were 

 more rigid and graceful in form, like a feather, being set with 

 branches of a third order which gradually shortened towards 

 the apex. On the main branch between the two larger opposite 



