50 



CARL SKOTTSBERG, MARINE ALGJE 2. RHODOPHYCE^. 



Returning to the Cape Horn plant, the true D. Davisii, we shall find that it ap- 

 proaches N. condensatum very close. I have examined three Kew specimens and one 

 in Brit. Mus. All the essential characters are present: mode of growth, marginal papillae, 

 anatomical structure. But the habit is different, thanks to the broad, less dissected 

 frond, the large veinless lobes and the few branches of the nerves. Unfortnnately, the 

 specimens are sterile. But D. Davisii is a Nitophyllum, it certainly comes near N. con- 

 densatum and may even be a young deep-water form of this, in which case the species 

 must be called N. Davisii. Agardh regarded D. Davisii as a typical member of Schi- 

 zoneura, while N. condensatum (as D. propinqua) was referred to Pteridium. 



Distribution: Fuegia, Falkl., S. Georgia, Kerg. 



Fig. 23. Gonimophyllum australe: ä cross section of female frond, b section through young cystocarp, C excentric section 

 through older cystocarp, d marginal part of cystocarp in section, both diagrammatic; e length section of tetrasporo- 



phyll. All X 240. 



Gonimophyllum B ätters Journ. Bot. 1892, p. 65. 

 G. australe Skottsb. in Kylin & Skottsb. p. 35, f. 17 b — d. — Fig. 22- 



23. 



To the short description of this parasite some remarks are added here. In the 

 smallest fronds a top-cell is present, but in the segments cut off from this intercalary 

 divisions quickly disturb the regular arrangement of cells, just as in Nitophyllum (fig. 

 22 a). In older fronds the top-cell is divided by more or less oblique walls (fig. 22 b, 



