20 CARL SKOTTSBERG, MARINE ALG-SI 2. RHODOPHYCEiE. 



P. coccineum Lyngb. — Kylin & Skottsb. p. 30. 



C h i 1 o é : San Pedro Island, 10 m, sand and gravel (St. 32, 28. 7. 08). Fal k- 

 land Islands: Sparrow Cove, 11—13 m, gravel (St. 9, 10. 1.08). 

 Distribution: Almost cosmopolitan (?) 



P. secundatum KtJTz. — Kylin & Skottsb. p. 31 f. 16. 



A common sublitoral species. Fuegia: Slogget Bay, in tide-pools (St. 47, 

 16. 3. 09, ©) and drifted (St. 47 b, $, ©); Orange Bay, 15 — 20 m, small stones (St. 44, 

 11. 3. 09). Falkland Islands: Cape Pembroke, in tide-pools (St. 3 b, 7. 11. 07). 

 South Georgia: Cumberland Bay, Boiler Harbour, 5 — 10 m (St. 48, 49, 20. 4. 

 09, $, ©); Strömaes Bay, c. 8 m (St. 50, 24. 4. 09, ©). 



Distribution: Fuegia, Falkl., S. Georgia. 



Delesseriaceae. 



While preparing, together with Professor Kylin, the report on my collection of 

 red algae from the Antarctic voyage, I soon became convinced that it was impossible 

 to arrive at a satisf actory arrangement of the Delesseriaceae on the basis of J. G. Ag årders 

 monograph, Sp. Alg. II: 3 (1898), which left the family in a state of serious confusion. 

 Ill-defined genera and tribes were created, species, that had little or nothing to do with 

 each other, were brought to the same genus, while others of close relationship became 

 widely separated. As Agardh did not pay any attention to the structure of the growing 

 apex, a better result could, perhaps, not be expected, but it should be noted that his new 

 classification, in which he pretends to express the true systematic position of the various 

 types, is inferior to his earlier treatment of the family. 



Quite a number of authors have occupied themselves with an analysis of the young 

 Delesseria frond. Nienburg, who made a comparative study of numerous species, 

 revealed to us the great value of the growth modus as a systematic character. It was 

 only because I did not want to delay the publication of our paper that I resolved to leave 

 the Delesseriae under current names, and to take up their study afterwards on fresh ma- 

 terial. To pull down and rebuild Agardh' s system is a serious undertaking. Practic- 

 ally every species must be studied as to anatomy, mode of apical growth, type of branch- 

 ing, position, development and structure of the reproductive organs. I began this 

 study in Uppsala, using the material in the Museum and the collections in Stockholm, 

 låter also the types in Herb. Agardh and numerous of Hooker's original specimens 

 in the collections at Kew and in the British Museum. A changed position in life has made 

 it difficult for me to proceed much further, at least at present. Thus, while I am able 

 to place most of the species belonging to the flora treated in this paper, I cannot draw any 

 far-reaching conclusions on the natural system of the family as a whole.j 



Nienburg distinguished two main types of apical growth, one sanguinea (Hypo- 

 glossum-) type and one sinuosa- ty ipe; it is of minor import ance here that his analysis of 

 the latter is unsatisfactory. Before him, other authors have discovered this difference, 



