503 
With regard to the opening through which the zoospores escape, 
I have in living material from the Faeroes most frequently found 
the opening to occur laterally in the middle of the cell, but it may 
also occur at the cross-wall, and specimens were sometimes met 
with, which had, as pointed out by Rosenvinge, two openings, 
one at the upper, and one at the lower end of the cell. 
This is a littoral species and is met with on exposed coasts at 
about high-water mark, and somewhat below it in sheltered loca¬ 
lities; in Skaalefjord (Ost.) where tides are not felt it grew at about 
the surface of the water. It occurs gregariously often associated 
with U.mirabilis. Found April—June, and had zoosporangia in the 
same months. 
This species is probably common along the coasts of the Faeroes 
and has hitherto been gathered in the following localities: — Ost.: 
Ejde (!), Glibre (!), Straender (!): Str.: Kvivig (!), Thorshavn (!). 
I presume that 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 list of the British marine Algae 
with an Appendix, London 1892, p. 73); an example gathered by Holmes, 
and determined by him as U. collabens , and presented to our Museum 
in Copenhagen looks like this species; the specimen I examined had, 
however, sterile cells only. 
CHAETOMORPHA Kiitz. 
182. Ch. Melagonium (Web. et Mohr) Kiitz. Kjellm., N. I., p. 382 
(311); Rosenv., Gronl. 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, fig. 1. 
This species has been found in the littoral zone in pools be¬ 
tween tide-marks 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 epiphytic, 
e. g., on the stem of Laminaria hyperborea. This species has been 
observed from April to December. 
It is very common along the coasts of the Fserdes as had already 
been noted by Lyngbye, who writes (1. c.): — »Ad insulas Fseroenses 
in superiori refluxus limite, ut ad Ridevig, Quivig, copiose«. 
183. Ch. tortuosa (Dillw.) Kleen. Kjellm., N. I., p. 384 (313); 
Rosenv., Gronl. Havalg., p. 917; Conferva tortuosa Lyngb., Hydro¬ 
phyt., p. 145. 
