28 M. FOSLIE. [1905 



There are some branching species along the coast of Norway r 

 most of them, however, more widely dispersed, which nearly run into 

 each other. They are frequently easily recognizable when vigorously 

 and typically developed, but as soon as they are attacked by animals 

 or grow in places not favourable to their development, they become 

 more or less va^'ing or stunted. Sometimes a species will even 

 assume forms which rather resemble specimens almost typically 

 developed of another species, or, more often of course, run into 

 forms of the same species more or less stunted. Cp. the intro- 

 ductory remarks. One of these species is L. glaciale. It is ex- 

 tremety varying and difficult of limitation. After a renewed and 

 careful examination of a large material from a number of localities, 

 and after succeeding in getting some curious specimens of one of 

 the forms nearly allied from the south coast of Norway and the 

 Bahusian coast of Sweden, I now find it necessary to take L- 

 glaciale in a more restricted sense than formerly. Even then, ho- 

 wever, it includes forms sometimes much diverging from each other. 



Thus 1 have found it almost impossible to draw any line be- 

 tween L. Granii, admitted below, and L. glaciale. Rut still I think 

 the former ought to be considered as an independent species also 

 closely connected with L. tophiforme. The same is the case of 

 L. colliculosum, which I must also look upon as an independent 

 species, though with a circumscription somewhat different from the 

 earlier one. Particulars are found under the species mentioned. 



As to the forms admitted above of the species in question, I 

 consider f. typica as the coarsest one and as the form which 

 reaches its most vigorous development within the arctic zone. Cp. 

 Kj ell man 1. c. t. 2. To this form is affined f. botrytoides, which 

 I originally looked upon as an independent species. In this form 

 the branches are considerably shorter and more delicate, developing 

 small bundles. It, therefore, often has an appearance greatly diverging 

 and corresponds to f. glomerata of L. intermedium. This form 

 sometimes is to be found coalesced with L. fomicatum. Young 

 specimens of f botryoides, or, strictly speaking, a form intermediate 

 between the said form and f subsimplex (partly also f. sub fastig lata) 

 is hardly distinguishable from L. tophiforme and L. Granii. ■ The 



