19 



Syn. Lithothamnion ramulosum Phil, in Wiegm. Arch. p. 388; Kiitz. Tab. 

 Phyc. 19, p. 35; Aresch. in J. Ag. Spec. Alg. 2, p. 524? 

 Lithothamnion ramulosum Solms Laub. Corall. p. 19.; ex parte? 



„ fasciculatum Farl. New Engl. Alg. p. 182; ex parte. 



„ Ungeri Kjellm. N. Ish. Algfl. p. 120 (91); excl. syn.; 



Fosl. Contrib. I, p. 8. 

 „ intermedium Stromf. Algveg. Isl. p. 19; Fosl. Contrib. 



I, P- ?• 

 „ „ Rosenv. Gronl. Havalg. p. 774? 



Remark on the determination of the species. As quoted below 

 under L. crassum I consider L. fasciculatum (Larn.) to be most 

 nearly connected or probably identic with that species. I conse- 

 quently do not adopt this name for the plant, that Hauck 1. c. 

 more nearly describes under the name of L. fasciculatum. Judging 

 from authentic specimens of the latter that I have seen, it in my 

 opinion appears noi to be identic with Lamarck's plant, although 

 probably nearly related to it. I on the other hand agree with 

 Hauck, that his plant most probably is to be referred to the same 

 series of forms as L. fruticulosum (Kiitz.), considered by Hauck 

 a variety of his L. fasciculatum, though in part rather differing 

 from that. Taking L. fruticulosum (Kiitz.) in the same sense as 

 Hauck it appears to constitute the typical form of a Lithotham- 

 nion, which on the one side approaches L. glaciale and other 

 species in habit, on the other side being closely related to L. cras- 

 sum Phil, and I regard the named typical L. fasciculatum Hauck 

 as one of the most extreme forms of this species, the above f. 

 ftexuosa. 



However, the limits between this species and L. crassum are 

 not easily drawn neither in regard to the external shape nor to 

 the structure. Hauck remarks I.e. „Manche Formen sind schwer 

 von L. crassum zu unterscheiden". I have seen too few specimens 

 of the latter, an apparently more southern species, to be able to 

 get any clear idea of their affinity to each other. In their typical 

 forms they certainly are easily distinguished and even more diffe- 

 ring than several other species of this genus. But on the other 

 hand L. fruticulosum is much varying and shows in its most 

 extreme forms close affinity chiefly to L. crassum, and even to 

 various other species which in their typical development are quite 



