No. 3] REMARKS ON NORTHERN LITHOTHAMNIA. 37 



f. glomerata Fosl. 



Lilhothamnion fruticulosum f. glomerata Fosl. Norw. Lithoth. (1895), p. 18, 

 pi. 4, fig. 3. 



In Norw. Lithoth. 1. c. I united L. intermedium and L. Ungeri 

 Kjellm., founding my statement on old specimens particularly of 

 the latter alga, much attacked by animals and partly worn by 

 friction of the water. Now, however, I take L. Ungeri in another 

 sense than Prof. Kjellman did 1. c, and I did in Norw. Lithoth. 

 Cp. below. I also take L. intermedium in a sense more limited 

 than originally taken by Prof. Kjellman. Thus I do not refer 

 to this species specimens branching from the centre of the frond, 

 or attached to stones, developing a very feeble basal crust not 

 producing lobes. This is the case with specimens in my collection 

 from Finmark, which Prof. Kjellman once referred to L. inter- 

 medium, and which I formerly considered as a form of this alga. 

 Such specimens I now think to belong to L. fornicatum. The 

 same may also be the case with the specimen pictured by Prof. 

 Kjellman 1. c. t. 4, fig. 1, which I have not seen. 



With this limitation 1 refer to L. intermedium only forms 

 with a basal crust as a general rule well developed, or a solid 

 central mass producing clumsy lobes, more or less distinct, simple 

 or divided, carrying branches subsimple or repeatedly divided, 

 which often form dense bundles. The circumscription and the 

 identification of the species, however, also in this sense is impeded 

 by the assiduous occurrence of animals destroying the older parts 

 and bringing about a greater fusion of the younger parts of the 

 alga. Certainly this species is much less exposed to being destroyed 

 than several other species, e. g. L. fornicatum, probably on ac- 

 count of its more solid basal or central parts. But on the other 

 hand, hardly any older specimen is found which is not to some 

 extent attacked by animals or does not serve as the residence of 

 such ones. 



When typically developed, L. intermedium bears in habit a 

 considerable resemblance to delicate forms of L. glaciate. The 

 form subdistans corresponds to f. subsimplex, partly also to f. 

 tgpica of L. glaciate, and the form glomerata corresponds to f. 



