12 M. FOSLIE [1899 



^4elobesia simulans Crn. 

 Fl. Finist. p. 150. 



= Dermatolithon (Herpomenia) hapalidioides (Crn.)' 



f. typica. 



A specimen of the above species distributed by Crouan him- 

 self, attached to a fragment of a shell of mollusk, almost fully 

 coincides in evcry respect with one of the specimens mentioned 

 above under D. hapalidioides. However, Crouan quotes the 

 sporangia to be tetrasporic, but a solitary conceptacle examined 

 b}^ me contained only bisporic ones. According to remarks on 

 the label, Dr. B o r n e t also found them to be bisporic. 



Melobesia confinis Crn. 



FL' Finist. p. 15L>. 



= Dermatolithon (Herpomenia) hapalidioides (Crn.) 

 f. confinis (Crn.) Fosl. mscr. 



Crouan mentions the above species to be found „sur les- 

 Corallinss, Patelles, etc." and Johnson^) quotes it from the west 

 coast of Ireland attached to the same substratum. I have not 

 seen certain specimens attaced to Corallina, and such as I have 

 seen growing on shells accord with typical D. hapalidioides. A 

 specimen from Crouan's herbarium collected at batterie du Diable^ 

 St. Anne, is on the contrarj' attached to Gelidium coriieum and 

 shells of Balanides to which the latter species sticks. So also as 

 regards specimens from Cherbourg distributed by Le Jo lis. 



The present alga so closely coincides with D. hapalidioides, 

 that it perhaps ought not to be maintained even as a denominated 

 form of the species. On the one side it certainly differs very much 

 in habit from the typical form but on the other hand even in this 

 respect running especially into the above quoted form of D. liapa- 

 lidioides growing on a loose substratum. A larger material per- 

 haps will show, that also the latter ought to be regarded as \. 



1) T. Johnson. A List of Irish Corallinaceæ. Scientific Proceedings of the 

 Royal Dublin Society. Vol. IX (N. S.). Part I, No. 3. Pag. 27. 



