No. 2] REMARKS ON LITHOTHAMNION MURMANICUM. 7 



der Glieder und die Anastomosen der Ruhren hier håufiger als in 

 ^ ^ jenen vorkommen". However, 



^Jfe^^^^yA AJ \^ the figure of the said plant 

 ^^^tt'^M rfc X*'-' ^^^ drawn by Unger 1. c, here 

 ^^^^■3^^^ ^^^^^ reproduced, is consistent with 

 ^•^^^ "V the form with sporangia bi- 



Uthothamnion tophiforme L'ng. sporic w'hich corresponds in 

 (After Unger). habit with L. soriferiini f. 



squarrosa, and which I have denominated L. tophiforme f. diver- 

 gens. It is peculiarly this form of the species that occurs on the 

 coasts of Greenland, whereas L. soriferum, in the limitation men- 

 tioned, is not yet known to have been found there. I, therefore, 

 thought I had better adopt the denomination of L. tophiforme 

 than give the plant a new name. There are several similar older 

 species that are identified only from habit-figures with an incom- 

 plete description, and there is — as far as I know — no regulation 

 in the rules of nomenclature rejecting the adoption of such a name. 



