KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 63. N:0 8. 



47 



have seen a great number of young proliferations and lobes. 

 the mode of growth as I have found it. 



Distribution: S. Chile to Fuegia, Falkl. 



Fig. 20 b — c illustrate 



N. condensatum (Reinsch) Skottsb. comb. nov. — Fig. 21. 



Syn. Delesseria condensata Reinsch, Meeresalg. Siidgeorg. p. 385, t. 7 f. 1 — 5; 

 D. laciniata Kutz. Tab. phyc. XVI t. 19, Kylin & Skottsb. p. 40; D. propinqua J. Ag. 

 in Hohenacker, Alg. mar. sicc. no. 250; D. pleurospora Har v. p. p., J. Ag. Sp. Alg. III, 

 p. 483; Pteridium (?) pleurosporum (Harv. ) J. Ag. 1. c. III: 3 p. 226 p. p.; P. Bertrandii 

 Cotton Crypt. Falkl. p. 184 t. 8; INithcphyllum affine Reinsch 1. c. p. 391 t. 5 f . 7—9. 



Fuegia: Slogget Bay, old plants with densely proliferous stipe, in tide-pools 

 (St. 47, 16. 3. 09, ©) and in beach drift (St. 47 b). Falkland Islands: West- 





Jn 





Fig. 20. Growing tips of a Nitophyllum laciniatum, b — C N. Durvillei, X 240. 



point Island, in deeper pools (St. 8 a, 5. 12. 07, ©). South Georgia, sublitoral: 

 Cumberland Bay, Boiler Harbour, 5 m (St. 48, 20. 4. 09); Bay of Isles, Rosita Harbour, 

 very dissected fronds, 8 m (St. 52, 25. 4. 4. 09, ?). 



Younger specimens have a thin, flabellate frond with a short semiterete stipe; 

 the lamina is split up into cuneate-falcate segments, with very conspicuous costa and irre- 

 gular secondary veins not reaching the margin. Fig. 21 a — c gives a good idea of the 

 habit, and other young specimens were figured by Cotton. Old plants are very much 

 dissected, the ultimate segments being linear and of ten quite narrow, as in Reinsch' s 

 figure; the stipe is long, terete and completely hidden under the innumerable prolifera- 

 tions. There is not the slightest doubt that all the specimens in the collections of 1902 

 and 1907 — 09 that I have named N. condensatum really belong together; further, the 

 South Georgian Delesseria quercifolia in my collection of 1902 also belongs here. It should 

 be mentioned that I possess all sorts of transitions between the intact, young fronds and 

 the old proliferating ones, and that fronds of very different habit may be found growing 

 from the same disc. 



