No. 2] REMARKS ON LITHOTHAMNION MURMANICUM. 7 
der Glieder und die Anastomosen der Röhren hier håufiger als in 
jenen vorkommen". However, 
the figure of the said plant 
drawn by Unger 1. c., here 
reproduced, is consistent with 
the form with sporangia bi- 
Bålelaammder tophiforme Ung. sporic which corresponds in 
(After Unger). habit with L. sortferum 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 åa 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 å name. 
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