20 CARL SKOTTSBERG, MARINE ALQJE 1. PHJE0PHYCE.a3. 



Ralfsia Berk. 

 R. australis no v. spec. — Fig. 8 n. 



Crustse dilute vel obscure olivaceo-brunnese, alise aliis superpositse, adultse sat 

 magnae, ambitu irregulari, superficie sicut squamosa, a substrato faeile separandse. 

 Species R. verrucosce similis sed ut videtur differt soris planis non elevatis nec non 

 absentia pilorum. Gametangia raro inventa, plerumque uniseriata, 5 — Q\s. crassa. 

 Sporangia ignota. 



Falkland Islands, shallow basins in Low Bay (St. 10 b, 18. 1. 08); 

 Westpoint Island (St. 8, 5. 12. 07, gt.). — Very like R. verrucosa J. Ag., but with 

 a more scaly appearance. It is quite possible that R. australis is a poor species, but 

 as hairs are missing and the appearance is somewhat different, it seems better to 

 give it a special name. According to Hauck, Meeresalg. p. 402, the supposed game- 

 tangia of R. verrucosa measure 8^ across, but other authors regard these organs as 

 altogether doubtful. It is also possible that my plant ought to be named R. expansa 

 J. Ag., a West Indian species lately treated by Börgesen, Mar. Alg. Dan. West 

 Ind. Pt. 2, p. 189 etc. The size of the gametangia is the same as in my plant, but 

 groups of hairs are abundant. The sporangium-plant of R. australis must be sought 

 for: if found, the position of the species will probably become better known. 



Desmarestiaceae. 



Desmarestia Lamx. 

 1). Willii Reinsch. 



Fuegia: Orange Bay, common in the sublit. 15 — 20 m (St. 44, 11. 3. 09). 

 Falkland Islands: tide-pools, Cape Pembroke (St. 3, 7. 11.07), Westpoint Isl. 

 (St. 8, 6. 12. 07); sublit., 8 m, Halfway Cove (St. 5. 25. 11. 07). SouthGeorgia, 

 sublit,: Boiler Harbour, 5 m (St. 48, 20. 4. 09), Stromnses Bay, 8—9 m (St. 50, 

 24. 4. 09). 



It is possible that the doubtful Trinitaria confervoides Bory (Voy. p. 216, tab. 

 24, fig. 2) is identical with D. Willii; J. Agardh, Sp. Alg. I p. 166, identified it with 

 his D. Menziesii, but Bory's figure is much more like D. Willii. 



Distribution: Subantarct.-circumpolar, antarct. 



I). Harveyana Gepp. 



Syn. D. compressa (Reinsch) Skottsb. Ant. Meeresalg. I, p. 19. 



South Georgia: Boiler Harbour, 5-10 m (St. 48, 49, 20. 4. 09). — Ac- 

 cording to the Vienna Rules D. Harveyana is the right name and not D. compressa. 

 But most likely both have to give room for D. Menziesii J. Ag. Sp. Alg. I, p. 165, 

 founded on specimens collected by Menzies at the South Shetlands, but never re- 

 corded again. The type in Herb. Agardh is quite like D. Harveyana, a common 

 Antarctic species. I had, however, no opportunity to study the anatomy of Menzies' 

 specimens. 



Distribution: S. Georgia, Graham Land, Victoria Land. 



