38 



named ones, nor of the carpospores, and it may be, that those I 

 have seen have not always been fully developed. 



Besides the Lithothamnia collected by myself, I have had the 

 opportunity to examine a rather great number of other specimens 

 from different localities and herbaria, also from abroad, and among 

 these several original specimens, which, I hope, has enabled me 

 to give to the following list of species a degree of accuracy it 

 could not otherwise have possessed. I would here express my 

 sincere thanks to Professor A. Blytt for his permission to exa- 

 mine the collection of algæ in the University's botanical Museum 

 at Christiania and fossil Lithothamnia collected by him at Bodø; 

 to Cand. real. P. Boye for specimens from the west coast; to 

 Cand. med. 0. Bugge for fossil specimens from Bodø; Mr. Kr. 

 Dahl for numerous specimens from the harbour of Vardø obtained 

 by the harbours stirring up mud; the Rev. Gunnar Frette for 

 winter-specimens from Frojen; Cand. real. H. H. Gran for various 

 species from the west coast and the Christiania Fjord; Docent B. 

 Hansteen for specimens from the west coast; Stud. techn. Sig- 

 vald Schmidt-Nielsen for specimens from the outer part of the 

 Trondhjem Fjord ; Conservator Sparre Schneider some species 

 found in a zoological collection from Spitzbergen brought together 

 by Capt. Niels Johnsen of Tromsø; Stud. med. Kr. Schreiner 

 specimens collected at Hero in Helgeland and summer- as well as 

 winter-specimens from the Christiania Fjord ; the head-master A. C. 

 Ullmann specimens from the botanical collection in Kragero Mid- 

 delskole; and Professor Dr. N. Wille specimens collected at Mandal. 

 I am particularly indebted to Mad. A. Weber van Bosse of 

 Amsterdam for several original specimens from the late Dr. F. 

 Hauck's herbarium for comparison; to Mr. E. A. L. Batters of 

 Wormley for several British specimens and informations as to 

 Harvey's Lithothamnia in Phyc. Brit.; Dr. Ed. Bornet of Paris 

 for an original specimen from Crouans exciccata for examination, 

 and various other French specimens; Mr. F. S. Collins of Malden, 

 Mass. for American specimens; Professor W. G. Farlow of Cam- 

 bridge, Mass. one of the species quoted in his Mar. Alg. New 

 Engl; Professor Dr. Chr. Gobi and Mr. C. Deckenbach of St. 



