- 148 — 



forms of M. globosuni are not easily distinguishable from M. Gorunnai, 

 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 eel. Djupivogur. 



N. I eel. Hrisey. 



NW, Icel. Kolbeinsa, Skalholtsvi'k ; AOalvi'k (Ldbk.). 



SW. Icel. Stykkishohnur, Reykjavik. 



.^yrionema faeroeuse Borgs., Faer. Alg. p. 424. 



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

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

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

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

 frond consists of simple or branched filaments. The fructiferous filaments 

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

 tig. 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 

 secimd, lateral branchlets ending in a sporangium, resembling Borgesen's 

 fig. 79, a, h (I. c). The sporangia are always considerably thicker than 

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

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

 7 — 8 //. I have not seen hairs. I have now and then met with uu- 

 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 

 1 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. fa^roense 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. ViOey, Reykjavik. 



Kjrioneina LaiiiiiiarliB^(K. Rosenv.). 



Dermatocelis Laminariae 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 Stromf., must be included in Myrionema. Rosenvinge (1. c.) 

 also points out the great resemblance between Dermatocelis and Myrionema 



