6 M. FOSLIE. [1908 
In a third paper) Mr. Elenkin declares my denomination 
Lithoth. topliforme Ung. in Rem. north. Lithoth. p. 51 to be 
ycontre toutes les lois de la nomenclature". He goes on main- 
taining that this species is identical with L. vardöense, and that 
both species belong to L. murmanicum. 
As I have observed above, I have thought it necessary for 
the circumscription of the species to give consideration to the parti- 
tion of sporangia. In consistency with this principle L. soriferum 
Kjellm. includes two species, one with tetrasporic sporangia and 
the other with bisporic ones. In describing L. murmamicum, Mr. 
Elenkin has acted up to the same principle; for otherwise he 
should have referred this plant to L. Ungeri, to which it is corre- 
sponding except in the fact that L. Ungerit is developing tetra- 
sporic sporangia, whereas L. murmanicum bears bisporic ones. 
I think it superfluous to enter on the supposition of Mr. 
Elenkin that L. tophiforme should belong to L. murmanicum. 
The consequence would be that also the corresponding species 
L. soriferum and L. Ungert had to be considered as identic. 
The plant denominated by Unger as Lithoth. tophiforme is 
indeed incompletely described?) and his referring to Millepora 
polymorpha var. tophiformis Esp. is hardly correct. He mentions 
it thus: ,BEine dritte strauchartige Art von Lithothamniwm mit 
glatter, glånzender Oberflåche und rosenrother Farbe, die ich Li- 
thothamnium tophiforme (Fig, 14) nennen will, ist durch die sparrig 
abstehenden, geweihförmig verzweigten Äste ausgezeichnet. Das 
abgebildete kleine Exemplar findet sich im kais. Hof-Naturalien- 
Cabinette und stammt aus Grönland. Es scheint mir der Mille- 
pora polymorpha var. tophiformis Esper zu entsprechen. Die 
Elementartheile und ihre Zusammensetzung sind ganz nach dem 
Schema der vorigen Arten, nur diirften die unregelmåssige Form 
1) Trav. Soc. Imp. des Naturalistes de St. Petersb. Vol. XXXVII, Livr. 1. No. 
7—8. (Russian with a summary in French). 
2) F. Unger. Beitråge zur nåheren Kenntniss des Leithakalkes, namentlich 
der vegetabilischen Einschiiisse und der Bildungsgeschichte derselben. —: 
Denkschriften der kaiserlichen Akademie der Wissenschaften. Mathematisch- 
naturwissenschaftliche Classe. Bd. 14. Wien 1858. P. 21, t. V, fig. 14. 
