— 108 — 



the coasts of the Færoes; in Iceland only on the South and the 

 South-west-coast and more sparingly here. 



Ceram. Deslongchampii Ghauv. 



Two individuals without organs of fructification and slightly 

 developed were found at Reykjavik in Iceland by Kolderup 

 Rosenvinge ( 5 /e 1886). 



Ceram. Areschougii Kylin. Plate II, fig. 10. 



This species which is easily discernible by the regular rows of 

 bark-cells in the lower parts of the zones and by the more or less 

 frequent occurrence of proteid-containing bark-cells was collected 

 at Ghristianshaab and Orpigsuit (pr. Ghristianshaab) in July 1890 

 by N. Hartz. Individuals from the last named locality were pro- 

 vided with cystocarps, those from Ghristianshaab were tetraspori- 

 ferous. All the individuals from Greenland are provided with 

 Floridean starch in the outermost bark. 



In the Herbarium of the botanical museum of Copenhagen 

 several individuals of a form referred to C. Areschougii and collected 

 by Kjellman in Spetsbergen are to be found. These individuals 

 are furnished in the lower parts with barrel-shaped links. In my 

 opinion it is these forms to which Agardh refers when he writes 

 about C. arcticum (Plate II, fig. 9) . . . "genicula juniora magis 

 adproximata, adultiora vero, diametro nunc duplo longiore formam 

 dolii aut lagenæ referentia, invicem subconfluentia". 



Ceram. fruticulosum Kütz. 



It is with doubt that I refer to this species several individuals 

 (provided with cystocarps) collected by H. Jönsson at Seltjarnarnes 

 (S.W. Iceland), 28 /s 1907 (together with C. rubrum). They are probably 

 referrible to forma rubroides. They also resemble C. Boergesenii. 



Ceram. Boergesenii sp. nov. ; Pl. II; fig. 8; Fig. I. 



Frondes plus minus robustæ. Fila dichotoma vel submonopo- 

 dialia axibus principalibus ramisque lateralibus (partim secundariis), 

 non habitum characteristicum afferentibus composita. Zonæ in parte 

 apicali non separatæ; zonæ in partibus superioribus ab utroque mar- 

 gine excurrentes. In parte intermedia et basali zonæ habitu earum in 

 G. fruticuloso-Areschougii, cum margine inferiori plus minus abrupto, 

 sæpe lingulato, instructæ. Gortex in partibus infîmis confluens. 

 Gellulæ axiales sæpe 2 J /2 mm. longæ. Pars externa corticalis cellulis 

 parvis c. 7 — 10// longis constat. Gellulæ réfringentes non adsunt 

 Tetrasporangia non prominentia, seriata. Gystocarpia non charac- 

 teristica; antheridia non visa. Pili fréquentes. Color rubiginosus. 

 In mari Færoensi frequens. 



