520 



Several beautiful specimens of it are to be found in Lyngbye's 



Herbarium in Copenhagen. Later on it was found by Rostrup 



at Tinganæs 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 Tinganæs and Kvivig, I have not suc- 



ceeded in finding this alga, which, judging also from its occurrenee 



along the Danish eoasts 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 

 Færoense in infimo refluxus litnite, ut a Quivig, sed raro«, as mentioned 

 above it has also been gathered at Thorshavn (Str.) by Rostrup and 

 by Randropp. 



Order DFRBESIACEAE. 

 DERBESIA Sol. 



200. D. marina (Lyngb.) Kjellm. Derbesia marina fran Norges 

 Nordkust (Bihang till K. svenska Vet.-Akad. Handlingar. Band 23, 

 Afd. III, Stockholm 1897); Vaucheria marina Lyngb., Hydrophyt., 

 p. 79, tab. 22. 



Along the Færoes this interesting alga had previously been 

 found by Lyngbye only, who in Hydrophyt. (1. c.) writes with 

 reference to its habitat: — »Habitat ad littus Færoense 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 Horne man' s, who has written on it: — »Vau- 

 cheria marina Lyngb., Quivig, Færoe«. It must, however, as Dr. 

 Kolderup Rosenvinge wrote to Kjellman (1. c. p. 11), who had 

 borrowed the specimen for examination, undoubtedly have been ga- 

 thered by Lyngbye, since the locality corresponds with thai given 

 by hint in Hydrophyt. (1. c). 



This year (1902) when I again visited the Færoes I was for- 

 tunate enough to lind this alga, and fairly abundantly. I found il 

 at a depth of some 8 fathoms on a ralher exposed coast near 

 Hvidenæs, growing on Balanus and Serpula. Il occurred on these 

 as a short, rather dense, occasionally somewhat luft-like expan- 

 sion, x /2 to 1 inch in height. Its habit and mode of growth agree 

 very well with Lyngbye's description, bul ils occurrenee on cal- 

 careous shells of animals at a depth of 8 fathoms dillers altogelher 

 from Lyngbye's statement mentioned above Unit it grows on rocks 

 al extreme low-waler mark. Kjell man (I. c. p. 7, cfr. also N. I., 



