— 152 — 



fully with my specimens, and both the Icelandic and Greenlandic plants 

 have the hairs enclosed in a sheat below. Regarding the chromatophores 

 both the Icelandic and Greenlandic plants agree fully with the specimens 

 from Heligoland. Erect assimilatory filaments are always wanting in my 

 specimens. 



This species is by Kuckuck (1. c.) regarded as an endophytic Phyco- 

 celis, and by Sauvageau (Myrionema p. 176) it is mentioned as a species 

 of Myrionema. If it is to be regarded as a species of Myrionema, I 

 think, that some other Ectocarpus (Streblonema) species e. g. E. Stilophoræ 

 Rke., Streblonema oligosporum Ström f., • E. repens Rke., E. terminalis Kuck, 

 a. o. must be considered as belonging to the Fam. Myrionemaceæ. As 

 Rosenvinge (Deux. Mém.) I prefer, at all events provisionally, to refer the 

 species to Streblonema. 



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

 prove to be much more common. 



E. I c el. Berufjöröur. 



NW. Icel. Koibeinsâ; Kollafjaröarnes (G. Guömundsson). 

 SW. Icel. Einarslön. 



Streblonema Stilophoræ Gr. var. cœspitosa Rosenv. Grl. Havalg, p. 892. 



I have found this species growing in Rhodymenia palmata, Punctaria 

 plantaginea, Phyllitis fascia, Scytosiphon lomentarius and young, litoral 

 specimens of Laminaria digitata. Gathered with plurilocular sporangia in 

 April — September. The Icelandic specimens agree well with Rosenvinge's 

 description, figures (1. c.) and original specimens. The endophytic portion 

 of the frond consists of repeatedly branched filaments, which sometimes 

 are united in a pseudoparenchyma. The basal filaments are usually about 

 7 p. thick, and are either composed of regularly shaped cells, 2 — 4 times 

 longer than broad, or unregularly shaped cells, comparatively shorter, the 

 broadest part of which can attain a thickness of 14//. The erect portion 

 of the thallus consists of branched fructiferous filaments and hairs. The 

 plurilocular sporangia are 26 — 60 fi long and 4 — T p. thick. The stalks 

 are usually somewhat narrower than the sporangia and are composed of 

 comparatively long cells. The length of the stalk is varying. The sporangia 

 usually consist of a single series of loculi and I have but seldom, in 

 the middle, seen two series. The endophytic filaments contain 4 — 6 disc- 

 shaped chromatophores in each cell. The base of the hairs is enclosed 

 in a sheath. In Rosenvinge's original preparations of the Greenlandic 

 plants and Börgesen's preparations of the Færoese specimens I have also 

 found the hairs enclosed in a sheath below. 



This species and Streblonema oligosporum Strömf. are nearly related, 

 but, as Svedelius points out (Östersjöns hafsalg. p. 104), they are not identic. 



