386 
mining the specimens in his herbarium. With regard to its habitat 
Lyngbye writes: — »Ad insulas Fseroenses in stipite Laminarise 
digitatse inter csespites 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 Tliorshavn and Hojvig (Lyngb.); San do: Skopen(!); Syd.: Tran- 
gisvaag (Rosenvinge). 
58. A. PJumula (Ellis) Thur. Rosenv., Gronl. 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. 
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 referred 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., 
Gronl. Havalg., p. 788). 
I have figured (fig. 59) a small portion of one of the specimens 
which are referred to forma corallina , as they differ somewhat from 
Kjellm an’s figures; 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 
