18 



CARL SKOTTSBERG, MARINE ALGJE 2. RHODOPHYCEiE. 



is repeated again, resulting in the adult plant seemingly possessing a percurrent stem 

 with distichous leaves. If more than one innovation arises, the stem becomes branched. 

 Proliferations from the stem may obscure the regular scheme, and as the stipes and 

 branches get twisted the distichous arrangement of the leaves is löst. It appears from 

 fig. 3 c that hapteres may act as stolons and give rise to new fronds. It should be men- 

 tioned that the two specimens figured are intact, and were detached from the rock by 

 the writer. 



The mode of growth in Dendrymenia is the same as in Nereoginkgo Kylin (K. & 

 Skottsb. p. 15, f. 6 b — c); indeed, the parallelism is rather surprising. The relations 

 between Dendrymenia and Rhodymenia are the same as between Nereoginkgo and Cal- 

 lophyllis. In the anatomical structure there is no tangible difference between the two 

 latter, and Dendymenia is quite like Rhodymenia in this respect (see fig. 3 f ). The crown 

 on the cystocarp in the former is not always well developed; still, there is no such crown 

 in Rhodymenia, as far as I have been able to ascertain. Collins, Chincha Isl., observed 

 apiculate cystocarps in Rh. »corallina», while Howe, 1. c. 126, did not find any »trace 

 of apiculum or crown». Be this as it may, the remarkable development of the thallus 

 in Rh. flabellifolia justifies, according to my opinion, the creation of a new monotypic 

 genus. 



Distribution: Peru and Chile, at least as far south as Concepciön. Quoted for 

 Fnegia and the Falklands by Habiot, Miss. Sci. p 77 (leg. d'Urville and Gaudichaud), 

 but this statement cannot be depended upon. Cotton 1. c. 181 doubts the correctness 

 of the Falkland record. All evidence as to its occurrence here rests on these specimens. 

 Of Gaudichaud's plant there are two fragments in Herb. Agardh (no. 26942), mis. 

 Freycinet, possibly rightly named; but I have ne ver seen the slightest trace of this 

 conspicuous alga in subantarctic seas. 





Rhodymenia (Grev.) J. Ag. 



Rh. corallina (Bory) Grev. — Kylin & Skottsb. p. 19 f. 10. 



South P a t a g o n i a : Otway Water, Puerto Toro, sublit. 20 — 30 m, gravel 

 and shell fragments, abundant (St. 16, 15. 4. 08). Fuegia : Slogget Bay, small spe- 

 cimens in tide-pools (St. 47, 16. 3. 09) and large ones in beach drift (St. 47 b). Fal k- 

 land Islands: Westpoint Island, in tide-pools, small and scarce (St. 8 a, 5. 12. 07); 

 Halfway Cove, sublit. 8 m, stones, scarce (St. 5, 25. 11. 07); additional locality from 

 1902: St. 53, 3. 9. 02. 



L. c. I expressed my opinion that Howe's Rh. corallina from Peru is different from 

 Bory's species. Of the latter I have examined authentic material in Herb. Agardh 

 (no. 26893), mis. d'Urville, showing that my southern species is, in any case, the true 

 corallina. Further, Dr. Howe kindly sent me a good set of specimens of his species. 

 Truly, the anatomical structure is almost the same in both, the Peruvian plant being 

 more delicate, with slightly smaller, more thinly walled cystocarps, but the habit is very 



