- 148 — 



form s of M. globosum are not easily distinguishable from M. Corunnæ, 

 especially the var. filamentosa. 



The species is only known from few places, but I think it will 

 prove to be much more common. 



E. I c el. Djupivogur. 

 N. I c el. Hrisey. 



NW. Icel, Kolbeinså, Skâlholtsvi'k ; Aöalvfk (Ldbk.). 

 SW. Icel. Stykkisholmur. Reykjavik. 



Myrionema færoense Borgs., Fær. Alg. p. 424. 



I have met with some few specimens growing on Rhodymenia pal- 

 mata, which fully agree with the original specimens of the Færoese plant. 

 The basal portion of the frond is a disc with marginal growth, composed 

 of one layer of parenchymatous cells, 7 p thick. The erect portion of the 

 frond consists of simple or branched filaments. The fructiferous filaments 

 are frequently simple, with a terminal sporangium, resembling Börgesen's 

 fig. 79, c (1. c), the stalk is of highly varying length and composed of 

 one or more cells. I have also, not seldom, seen branched fructiferous 

 filaments, the upper part of which bore few or many, more or less 

 secund, lateral branchlets ending in a sporangium, resembling Börgesen's 

 fig. 79, a, b (1. c). The sporangia are always considerably thicker than 

 the stalk, and I have never seen sessile sporangia. They are 29 — 

 87 fx long and 10 — 14 thick, and the thickness of the stalk is about 

 7 — 8 fx. I have not seen hairs. I have now and then met with un- 

 branched sterile filaments, which, 1 think, are to be considered as assimi- 

 lative filaments. There is one chromatophore in each cell and as far as 

 I can see in the alcohol material, it seems to be a lobed plate. 



The species resembles somewhat Myrionema majus Fosl., but differs 

 from it by the absence of hairs and by the number and shape of the 

 chromatophores. M. færoense has one chromatophore in each cell while 

 M. majus has, according to Foslie (Gontrib. II, p. 15), 6 — 10 small, disci- 

 form or plate-shaped chromatophores in each cell. 



Gathered with plurilocular sporangia in April. 



SW. Icel. Viöey, Reykjavik. 



lyrionema Laminariæ (K. Rosenv.). 



Dermatocelis Laminariæ K. Rosenv. Deux. Mem. p. 89, fig. 21. 



As some species of Myrionema are more or less endophytic and 

 destitute of assimilative filaments the genus Dermatocelis, as well as 

 Phycocelis Strömf., must be included in Myrionema. Rosen vinge (1. c.) 

 also points out the great resemblance between Dermatocelis and Myrionema 



