503 



With regard to the opening through which llie zoospores escape, 

 I have in living material Ironi the Færoes most frequently found 

 the opening lo occur laterally in llie middle of the cell, bul il mav 

 also occur al llie cross-wall, and specimens were sometimes met 

 with, which had, as pointed onl by Rosenvinde, hvo openings, 

 one at the upper, and one al the lower end of the cell. 



This is a litloral species and is mel with on exposed coasls al 

 abonl high-water mark, and somewhat below it in sheltered loca- 

 li ties ; in Skaalefjord (Ost.) where lides are not felt il grew al aboul 

 llie surface of the water. It occurs gregariously often associaled 

 with U. mirabilis. Found April — June, and had zoosporangia in llie 

 same months. 



This species is probably common along the coasls of the Færdes 

 and has hitlierlo been gathered in the following localities: — Ost.: 

 Ejde(!), GlibreO), Strænder(!); Str.: Kvivig (!), Thorshavn (!). 



I presume tlial the Urospora collabens figured and described by 

 Harvey in Phycol. Brit. belongs to this species; it is likewise recorded 

 by Holmes and Batters (A revised lisl of the British marine Algae 

 with an Appendix, London 18 ( .)2, p. 73); an example gathered by Holmes, 

 and determined by him as U. collabens, and presented to our Musen in 

 in Copenhagen looks like this species; the specimen I examined had, 

 however, sterile cells only. 



CHAETOMORPHA Kutz. 



182. Ch. MeJagonium (Web. et Mohr) Kiitz. Kjellm., N. I., p. 382 

 (311); Rosenv., Grønl. Havalg., p. 917; Conferva Melagonium Lyngb., 

 Hydrophyt., p. 148. 



It seems to me that all the material I have had for examina- 

 tion may be referred to f. rupincola Aresch., Kjellm. (1. c), Flora 

 Danica, tab. 2397, lig. 1. 



This species has been found in the littoral zone in pools be- 

 tween tide-niarks and in caves, as well as in the sublittoral. It 

 grows both on exposed coasts and in more sheltered localities, and 

 is commonly attached to rocks and stones, but occurs also epiphylic, 

 e. g., on the stem of Laminaria hijperborea. This species has been 

 observed from April to December. 



It is very common along the coasts of the Færoes as had already 

 been noted by Lyngbye, who writes (1. c): -- »Ad insulas Færoenses 

 in superiori reiluxus limite, ut ad Bidevig, Quivig, copiose«. 



183. Ch. tortuosa (Dillw.) Kleen. Kjellm., N. I., p. 384 (313); 

 Rosenv., Grønl. Havalg., p. 917; Conferva tortuosa Lyngb., Hydro- 

 phyt., p. 145. 



