209 



M. FosLiE (1900), Revised systematical Survey of tlie Melobesieae. Ibid. 1900. No 5. 



— (1905), Remarks on Northern Lithotliamnia. Ibid. 1905. No 3. (Issued 1906). 



— (1909), Algologiske Notiser. VI. Ibid. 1909, No 2. 



F. Haock, Die Meeresalgen Deutschlands und Oesterreichs. Leipzig 1885 (1882 — 1885). 



F. Heydrich (1900), Die Lithothamnien von Helgoland. Wissensch. Meeresunters. N. F. IV. Band. Abt, 



Helgoland. Kiel und Leipzig. 

 Mme Pai l Lemoine (1911), Structure anatomique des Melobesiees. Application a la classification. Annales 



de rinstitut Oceanographique. Tome II fasc. 2. 



F. Minder, Die Fruchtentwicklung von Choreonema Thureti. Freiburg i. Br. (s. a.) 



R. PiLGER (1908), Ein Beitrag zur Kenntnis der Corallinaceae. Engler, Botan. Jahrbiicher. 41. Bd. 



S. RoSANOFF (1866), Recherches anatomiques sur les Melobesiees. Memoires de la soc. sc. nat. Cherbourg. 



Fr. Schmitz und P. Hauptfleisch (1897), Corallinaceae. Engler u. Prantl, Nat. Pflanzenfam, 1. 2. Leipzig, 



Solms-Laubach (1881), die Corallinenalgen des Golfes von Neapel. Leipzig. 



H. F. G. Stromfelt (1886), Om algvegetationen vid Islands kuster. Goteborg. 



N. SvEDELius (1911), Corallinaceae. Engler u. Prantl, Nat. Pflanzenfam. Nachtr. zu I. Teil, Abt. 2. Leipzig. 



G. Thuret (1878), Etudes phycologiques. Publ. par les soins de M. le dr. E Bornet. Paris. 



When carrying out my systematic investigations in the Danish waters, I ar- 

 ranged with M. FosLiE, the well-known authority on calcareous algse, that he should 

 deal with the Melobesiece-gvoup of the family of Corallinacece, and forwarded to him 

 accordingly, from time to time, such material as I had collected of these algse, 

 which he also mentioned in various publications. Unfortunately, M. Foslie's 

 energetic work in this held was brought to a close by his unexpected and prema- 

 ture decease in 1909. Since then, I have collected but few calcareous algae, and 

 nearly all the present specimens from Danish waters have thus been determined 

 by FosLiE. As we know, this writer repeatedly altered his view concerning the 

 limitation of these difficult species, and his last great work on Northern Melobesieae 

 (Remarks 1905) bears evident witness to his indecision on this point. When, after 

 his demise, I myself took up the task of dealing with this group, I considered it 

 necessary to investigate all species by means of microtome sections, in order to 

 obtain closer knowledge as to the structure of the frond and reproductive organs, 

 being also further instigated hereto by the newly published works of Pilger, Mme 

 Lemoine and Minder. In many cases, the results attained were disproportionate to 

 the amount of time involved, partly owing to the fact that the great bulk of the 

 material had only been preserved in a dried state, and also because suitable devel- 

 opmental stages of the various sorts of conceptacles were in many cases lacking. 

 With regard to distinction of species, for the Lithothamnia I have in the main fol- 

 lowed FosLiE in his valuable work above-mentioned ; on the other hand, closer in- 

 vestigation has led me to distinguish several new Melobesia species. 



With regard to structure and development of the frond and reproductive 

 organs, I may refer to the works above quoted by Rosanoff, Solms, Pilger, Mme 

 Lemoine, Minder and Svedelius, as also to what is stated below with regard to 

 the various species. It will here suffice to mention certain particular features. 



The frond is in all cases composed of branched cell filaments, the cells of 

 which are connected up by pits of the structure characteristic in Florideae, in the 

 middle of the transverse walls. These pits are however, very thin, and are often 



D. K. D. Vidensk. Selsli. Ski-,, 7, Rickke, milurvidensk. og matliem. Aid. VII. 2 27 



