382 The Scottish Naturalist. 



SOME EEMAEKS ON BRITISH SUBMARINE VAUCHERLE. 



By Prof. O. NORDSTEDT. 



IN the "Scottish Naturalist," April, 1886, Mr. E. M. Holmes 

 has published a paper on " British Marine Algae," and, 

 therefore, I may here publish some remarks and additional notes 

 in place of a complete account of this matter, as had previously 

 been my intention. 



Page 261, I.e. between nos. 7 and 8 there is a line omitted, viz. 



(b) Oogonia not attached directly to the thallus, but separated 

 from it by a short empty cell. 



The four lines from the bottom of page 262, and the 4 lines 

 from the top of page 263 : " It differs .... sea water " 

 (except fig. 6 a.) do not belong to V. spharospora, but to V. 

 litorea. 



It is impossible to decide what species V. vehctina, Harv. really 

 is. The figures and description in " Phycol. Brit," however, do 

 not prevent its being V. sphcerospora. The specimen figured I.e. 

 tab. 321, was gathered at Cushenhall, in Ireland. A specimen 

 from a Scottish locality, mentioned by Harvey, Appin, (on the 

 label, Vaucheria littoralis ; V. velutina, Ag., leg. Capt. Car- 

 michael), I had an opportunity of examining in the Herbrium 

 of the Royal Kew Gardens. In that I met only with V. sphcero- 

 spora. This locality is not far from Ballachulish, where I saw the 

 filaments of V. sphaerospora and V. Thuretii closely woven to- 

 gether. 



The original specimens of V. velutina, Ag. in Herb. Agardh 

 belong to V. Thuretii Woron. (cfr. "Botan. Notiser," 1878, 

 p. 176). 



Sometimes the oospore of V. sphceospora is monstrous, not quite 

 globular, but obovate. Being so, it looks like V. subsimplex, 

 Crouan. It is possible that V. sphcerospora and V. subsimplex 

 are identical, but, also, not quite impossible that there is a 

 Vaucheria agreeing with the figures and description in " Flore du 

 Finistere" (1867), p. 133, tab. 10, fig. 1—4. 



In V. sphaerospora, as in most of the other submarine monoicous 

 species, the antheridia are attached to the oogonium, or some- 

 times immediately beneath it, sometimes at a distance from it, on 



