14<J 



saying: „Notre plaiUe pourrait elre regardee enfin comme une forme reduilo, 

 endophyte, de Myrionema ayant perdu les filaments assimilateurs". 



To this species 1 'have referred some specimens growing in tlie 

 onter membrane of Laminaria saccharina f. phyHitis gathered in pools in 

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

 Rosenvinge's description and figures (1. c. fig. l^L, 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, hi other respects my plant are 

 fully agreeing with Rosenvinge's description. ^. ,, ,, , . ^^ ^. 



SVV. Icel. Einarslon. Laminariai (K. Rosenv.). 



Compare tlie text. 31<>: 1. 



Fig. 10. 



Fi- 11. 



Ascocyclus islandicus. 



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

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

 in different stage uf development and hasal hairs, in a with a siieatii helow. 

 The young erect tilaments are situated nearer llie margin, the more developed 

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



.isfocyclus islandii'iis nov, spec. 



I have found this species on Rhodymenia palmata in the litoral 

 region , growing in company with Myrionema globosum , Streblonema 

 Stilophoras var. caespitosa, young Ralfsia sp. a. o. It forms small spots of 



