KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 61. N:0 II 



13 



fertilia. Gametangia siliquiformia, apicalia (saepe bina) vel lateralia, 40 — 125 X 

 X 18 — 32 {t, pluriseriata. Sporangia non visa. Pili 6 — 7[j. diam. 



Patagonia: Skyring Water, Puerto Altamirano, in the sublitoral region, 

 5 — 10 m, on Castagnea Zosterce (St. 19, 23. 4. 08, gt.). 



Of all species known this seems to come nearest to S. Cooki Howe from the 

 Peruvian coast (Alg. of Peru p. 48, Plate 11). It differs from this by the smaller 

 dimensions, by the absence of long external filaments, by longer, sometimes longitu- 



Fig. 5. Streblonema patagonicum : a portion of höst vvith endophytic filaments, X ISO; 



b — d plants with gamatangia, X 1H0; e ehromatophores, X 3(50; f two gametangia, X 360; 



g anomalous germination in gametangium, X 360. 



dinally divided cells and also by the presence of hairs. The shape of the ehromato- 

 phores is also different. It is the first Streblonema described from Subantarctic 

 waters. In several instances gametangia were found where the contents of the locelli 

 had germinated, comp. fig. 5 g. These gametangia being pauciseriate, it is probable 

 that germination took place before the divisions had been completed and that no 

 gametes had been formed. 



Myrionematacese. 



Under this heading a number of genera of rather doubtful position have been 

 joined. Hecatonema, placed near Myrionema by Sauvageatj, was remowed to the 

 Ectocarpacese by Svedelius in Engl. & Prantl. But then, it will be difficult to 



