50 



4 



Tromsø Museums Aarshefter. 14. 1891. 



Phyc. Scand. p. 349. It seems to be rather commonly dia- 

 persed along the southern and south-western part of our 

 coast. It appeared in great number at Lindesnes. 



Ascocyclus foecundus (Stromf.) Kke. 



Algenfl. p. 46; Phycocelis foecunda stromf. in Notarisia 1888, p. 383. 

 Beser, et Fig. Phycocelis foecunda Stromf. 1. c. et t. 3, fig. 5. 



Last summer I met with this plant at Mestervik in 

 Malangen growing on Rhodymenia palmata at low-water mark 

 of neap tides along the edges of a small but heavy current 

 («Strommen»), local but abundant. 



The specimens were larger than those mentioned by 

 S t r 6 m f e 1 1 (1. c.) from Haugesund, the basal disk until 

 3.5 mm. in diameter and not seldom united to one another. 

 The upright filaments are in the centre of the frond 40 — 70 

 \k high and 7—11 |x thiek. Only very fe w of them were 

 transformed into gametangia when eollected in the middle of 

 September. 



Ascocyclus major nob. 



Å. thaJlo filis ereetiusculis e strato bas ali suborbiculare (diametre 

 0.5—1.5 mm.) egredientibus, eramosis, æqualibus vel interdum subattenu- 

 atiB, 350 — 700 fi longis, 10 — 13 jj. crassis, cellulis eylindricis, diametro 

 æqualibus ad 2 ! / 2 P l ° longioribus; gametangium singulum observavit, in* 

 fra apice filæ pedimculo 2 cellulari auffulto, oblongo, 31 fi longo, 13 /* 

 crasso. 



The plant forms small spots on the leaf of Laminaria 

 saccharina. The basal disk is more or less circular, 0.5 

 1.5 mm. in diameter and not seldom becoming confiuent, pa- 

 renchymatic, with the cells radiating from the centre and 

 mostly squarish or rectaugular. The disk of the specimens 

 examined shows, in a cross section, a single layer of cells. 

 These specimens were, however, not fully developed. The 

 chromatophores are small, disciform or plate-shaped and ge- 

 nerally 6—10 in number in each cell. J?rom the middle oi 



