63 



Syn. Lithothamnion rubrum Phil. 1. c. ; Aresch 1. c. 



„ norvegicum Kjellm. N. Ish. Algfl. p. 122 (93), pi. 5, 



fig. 9—10. 

 „ „ Fosl. Contrib. H, p. 7; ex parte. 



„ coralloides Batt. in Journ. Bot. 1892, p. 7. 



Remark on the determination of the species. Through the 

 kindness of Dr. Bornet I have had the opportunity to examine 

 the specimen distributed by Crouan 1 c. under the name of 

 Spongites coralloides. It is, however, too fragmentaiy to be deter- 

 mined with certainty, but not unlikely it is identic with the above 

 quoted f. flabelligera, and it agrees with this form in regard to 

 the structure. The form of the species delineated in Fl. Finist. 1. 

 c, no doubt, is identic with or at least closely related to the above 

 f. australis. Specimens of both these forms have been gathered 

 in one of the localities quoted by Crouan and kindly communi- 

 cated to me by Dr. Bornet. The plant described by Areschoug 

 under the name of L. calcareum var. norvegicum partly also in- 

 cludes the last named form. Areschoug originally recorded his 

 plant as L. coralloides Cr. 1 ), but later (in Obs. Phyc. 1. c.) he 

 considered it a variety of L. calcareum. The latter is, however, 

 a coarser plant and in my opinion belonging to L. tophiforme, 

 judging from the description by Harvey in Phyc. Brit., but the 

 plant recorded under the same name by Johnston 1. c. perhaps 

 in part includes the present species. Cp. Kjellm. 1. c. I have 

 not been able to draw any true limit between the quoted forms, 

 and I, therefore, here adopt the name given by Crouan as the 

 older one. However, it may be remarked, that the French and 

 British specimens that I have seen, as well as those which underlie 

 Areschoug's description, gathered at Haugesund, are sterile. 

 Solms-Laubach remarks (Corall. p. 19), considering Areschoug's 

 plant identic with L. coralloides Cr., that the species is characte- 

 rized, besides in habit, by „nicht iiber die Thallusflache hervorra- 

 genden Conceptacula". This does not accord with the below men- 

 tioned shape of the reproductive organs found in other Norwegian 

 specimens. 



*) Akademiske forelasningar hostterminen 1872. (Unprinted). 



