— 149 — 



saying: „Notre plante pourrait être regardée enfin comme une forme réduite, 

 endophyte, de Myrionema ayant perdu les filaments assimilateurs" . 



To this species I have referred some specimens growing in the 

 outer membrane of Laminaria saccharina f. phyllitis gathered in pools in 

 the litoral region. The basal disc of my specimens agrees entirely with 

 Rosenvinge's description and figures (1. c. fig. 2L, D, E). The erect portion 

 of the frond was composed of short, free filaments, the cells of which 

 were much shorter than long (Fig. 9). These 

 filaments, I think, ought rather to be regarded 

 as young plurilocular sporangia than as assimi- 

 lative filaments. In other respects my plant are 

 fully agreeing with Rosenvinge's description. Fig Q Myrionema 



SW. I c el. Einarslön. Laminarice (K. Rosenv.). 



Compare the text. 316 : 1. 



Fig. 10. Fig. 11. 



Äscocyclns islandicus. 

 Fig. 10 a, b two- portions of the margin. (215: 1.) 

 Fig. 11. a, b fragments of two radial filaments showing the erect filaments 

 in different stage of development and basal hairs, in a with a sheath below. 

 The young erect filaments are situated nearer the margin, the more developed 

 nearer the centre. The plurilocular sporangia for the most part sessile. (313: 1.) 



Asoocyclus islandicus nov. spec. 



I have found this species on Rhodymenia palmata in the litoral 

 region , growing in company with Myrionema globosum , Streblonema 

 Stilophoræ var. cæspitosa, young Ralfsia sp. a. o. It forms small spots of 



