— 366 — 



as figured by Wille (Studien Tab. IV, fig. 162— 164). The rhizoids are 

 very rare in my material and consist only of one cell, which is not 

 separated from the mother cell by a wall (cfr. Rosenv. 1. c. fig. 34). I 

 have usually found the short cells containing 2 nuclei, in somewhat longer 

 cells 4 nuclei not rarely occur, and in very long cells I have sometimes 

 met with a higher number of nuclei, up to 9. F. valida usually contains 

 2 nuclei in each cell, but 4 nuclei also frequently occur. Wille (Studien 

 p. 39) is of the opinion that the occurrence of more than 4 nuclei in 

 each cell is to be regarded as abnormal in this species. 



The f. implexa I have found growing on earth above high-water 

 mark in company with Percursaria percursa, and in tide pools at high- 

 water mark. I have once found it in a pool floating in the water in 

 large entangled masses like Ghætomorpha tortuosa. 



The species is probably common at the Icelandic coasts. 



E. I c el. Vattarnes, Brimnes, Borgarnes, Borgarfjöröur. 



N. 1c el. Grimsey (O. D.). 



NW. I cel. Kolbeinsâ, Broddanes. 



SW. I cel. Flatey , Akurey near Arnarbæli, Röstin, Stykkishölmur, 

 Hrûtey near Bjarnarhöfn. 



Spongomorpha *) vernalis (Kjellm.), Acrosiphonia vernalis Kjellm. 

 Acrosiphonia p. 82. 



My specimens are 1 — 1,5 cm. high and the thickness of the lower- 

 part of the main branches varies from 15 — 29 yt. The sporangia occur 

 10—16 or up to 50 in a continuous row. Incurved or hooked branches 

 are rare and the cells contain only a single nucleus. As my plants in 

 other respects seem to agree very well with Kjellman's description of 

 Acrosiphonia vernalis (1. c), I have referred them to it. 



The Icelandic plants occur on stones in the litoral region associated 

 with species of Acrosiphonia and in the uppermost sublitoral region in a 

 depth of 1 fathom. Fructiferous specimens have been gathered in August 

 and October. 



SW. IceT. Melar, Reykjavik. 



Spongomorpha sp. 



At Reykjavik I have moreover met with some sterile specimens of a 

 Spongomorpha growing on Laminaria hyperborea in a depth of 1 — 2 fathoms. 

 The main branches were 15 — 22/* thick and had only some few, for 

 the most part secund branches. Neither stolons nor incurved or hooked 

 branches were occurring. These specimens seem to remind somewhat 



!) Cfr. Wille in Botaniska Notiser 1899, p. 281, and my footnote p. 367. 



