520 
Several beautiful specimens of it are to be found in Lyngbye’s 
Herbarium in Copenhagen. Later on it was found by Rostrup 
at Tinganses in Thorshavn, and specimens from the same locality 
were, moreover, sent to Rostrup by Mr. Randropp. In spite of 
a very close search both at Tinganses and Kvivig, I have not suc¬ 
ceeded in finding this alga, which, judging also from its occurrence 
along the Danish coasts is of a somewhat sporadic habit. Lyng- 
bye has gathered it on the 17th of May and on the 24th of August. 
With regard to its habitat he writes (1. c.): — »Habitat ad littus 
Fseroense in infimo refluxns limite, ut a Quivig, sed raro«, as mentioned 
above it has also been gathered at Thorshavn (Strjj by Rostrup and 
by Randropp. 
Order DERBESIACEAE. 
DERBESIA Sol. 
200. D. marina (Lyngb.) Kjellm. Derbesia marina frail Norges 
Nordkust (Bihang till K. svenska Vet.-Akad. Handlingar. Band 23, 
Afd. Ill, Stockholm 1897); Vaucheria marina Lyngb., Hydrophyt., 
p. 79, tab. 22. 
Along the Faeroes this interesting alga had previously been 
found by Lyngbye only, who in Hydrophyt. (1. c.) writes with 
reference to its habitat: —*■ »Habitat ad littus Faeroense in infimo 
refluxus limite, ut ad Quivig, sed raro«. 
There is only one specimen of it preserved in Lyngbye’s Her¬ 
barium, which is unfortunately not labelled in Lyngbye’s hand¬ 
writing, but in Ho me man’s, who has written on it: — »Vau¬ 
cheria marina Lyngb., Quivig, Faeroe«. It must, however, as Dr. 
Kolderup Rosenvinge wrote to Kjeliman (1. c. p. 11), who had 
borrowed the specimen for examination, undoubtedly have been ga¬ 
thered by Lyngbye, since the locality corresponds with that given 
by him in Hydrophyt. (1. c.). 
This year (1902) when I again visited the Faeroes I was for¬ 
tunate enough to find this alga, and fairly abundantly. I found it 
at a depth of some 8 fathoms on a rather exposed coast near 
Hvidenaes, growing on Balanus and Serpula. It occurred on these 
as a short, rather dense, occasionally somewhat tuft-like expan¬ 
sion, 1 /2 to 1 inch in height. Its habit and mode of growth agree 
very well with Lyngbye’s description, but its occurrence on cal¬ 
careous shells of animals at a depth of 8 fathoms differs altogether 
from Lyngbye’s statement mentioned above that it grows on rocks 
at extreme low-water mark. Kjellm an (1. c. p. 7, cfr. also N. I., 
