528 



with several of the blue-green algæ which occur along the coasts 



of the Færoes. 



It has been found in several piaces along the coasts of the Færoes, 

 and is probably common. 



RIVULARIA Rotb. 



216. R. atra Roth 1 . Catalecta botanica III, p. 340. 



Found near high-water mark on exposed coast as well as in 

 sheltered localities. It often grows at such a considerable height 

 that it can only be wetted by the spray, and is, consequently, sub- 

 ject to desiccation for a longer period at a time. 



Met with in July, October and November. 



Found hitherto only in the following localities: — Vid.: Ostvig and 

 Vedvig (H.J.); Kun 6 (H. J.); Ost. (H. J.); Str.: Thorshavn (!). 



1 Determ. Joh s. Schmidt. 



ADDENDA ET CORRIGENDA. 



As that part of my paper in which the Fucus has been treated was 

 already ready printed in the beginning of July I have not been able to 

 refer to the description of Fucus spiralis L. given by Ratters in his paper 

 »A Catalogue of the British marine Alga 1 « (Journal of Rotany, Vol. XL, 

 September 1902, Supplement, p. 50), in which he has expressed the same 

 opinion of this species as I have in my present paper. 



To avoid confusion I may remark that when I write at pp. 465— 6: 

 »Fucus distichus L., Lyngb., Hydrophyt., p. 6 (partim, e specim.)< then it is 

 to be understood that I fully agree with Lyngbye's definition of this 

 species, but his synonyms (with exception of Fucus distichus L.) should 

 be excluded, as also his herbarium contains, besides typical specimens 

 which correspond with his description, also one from the Færoes, which 

 is somewhat similar to f. linearts. 



At page 346 and throughout for fructifging read fruiting ; pages 371, 

 403, etc. for fructify read fruil. 



At page 383, Fig. 5<S, for Callithamnion granulatum (Duel.) Ag 



read C. conjmbosum (Smith) Lyngb. 



At page 349, Lyngbye (Hydrophyt., p. 10) ... read p. 29. 



