32 M. FOSLIE. [1905 



belonging to L. glaciale. Cp. Saunders 1. c, Setchell and 

 Gardner 1. c. The specimens, besides, seem to be young and 

 are fragmentary, particularly those collected by Dr. Saunders 

 which I have earlier indicated as uncertain. The specimen from 

 Whidbey Island, Wash. (Setchell and Gardner) bears a striking 

 resemblance to young L. glaciate f. subsimplex, but also recals 

 young L. colliculosum. It bears a few conceptacles of sporangia, 

 which are convex, but little prominent, 300—400 p- in diameter. 

 The sporangia are two-parted. In many places, however, even 

 species rather widely different are — as is pointed out above — 

 under certain circumstances almost running into each other. As 

 it has recently been proved how e. g. Phymatolithon compactum 

 on the north and northwest coast of America runs into Ph. locu- 

 losum so that it seems almost impossible to draw a line between 

 them, while specimens typically developed are widely different, 

 there may also be left an opening for the supposition that the 

 specimens referred to L glaciale may belong to another species, 



e. g. L. japonicum. This can not be decided from so incon- 

 siderable a material as that which I possess at present. I have 

 already in the description of L. japonicum (New or crit. calc. Alg. 

 p. 6) stated that it very nearly approaches L. glaciale. But of 

 the former there is only a single specimen without sporangia, and 

 a possible identity does not at present seem to be probable. 



As to the distribution of each individual form is to be obser- 

 ved that f. typica and f. subsimplex occurs most frequently within 

 the arctic zone ; f. botrytoides is known from Ikamuit and Egedes- 

 minde on the west coast of Greenland, from Mestervik in Malangen 

 near Tromso (Norway), from Loppen and Altenfjord, in the two 

 places last mentioned, however, are only found young specimens ; 



f. subfastigiata particularly occurs in the southern part of the 

 area of distribution. 



Area: Norway: From the north-eastern boundary to the 

 Trondhjem-Fjord (Kleen, Kjellman!,!) 1 ); Iceland (Stromfelt, 



1 ) The specimens from the Trondhjem Fjord are much attacked by boring 

 mussels, the crust dissolved and the branches rather coalescing, but prob- 

 ably belonging to f. subfastigiata of this species. 



