381 
50. C. polyspermum (Bonnem.) Ag. Kjellm., N. I., p. 223 (177). 
I have only felt justified in referring a few specimens collected 
from Trangisvaagfjord by Rosenvinge to this species. These 
differ from Callith. scopulomm in their darker colour, their some¬ 
what larger size, and more particularly in their being fairly rich 
in cortical cells; for further details I must refer to the above men¬ 
tioned species. Kjellm an (1. c.) points out that the Nordland spe¬ 
cimens resemble Kiitzing’s figure (Tab. Phyc. 11, tab. 97), but not 
Harvey’s figure in Phycol. Brit. pi. 231; and this is also the case 
with the Faeroese specimens. 
It is presumably a littoral species, and it had tetraspores in May. 
Found only near Tvseraa in Trangisvaagfjord (Syd.) by L. K. Rosen¬ 
vinge. 
Callithamnion lanuginosum Lyngb., Hydrophyt., p. 130, 
which according to Lyngbye has been found: »ad insulas Fseroenses 
in Hutchinsia urceolata aliisque parasitice, raro« seems to be young 
specimens of Chantransia virgatula. There are, however, only a 
very few fragmentary pieces of it in Lyngbye’s Herbarium, and 
on the label Ly ngbye accounts for its scarcity as follows: »Abun- 
dabat, sed exemplaria perierunt«. According to Rostrup (l.c. p.85) 
it is identical with C. Dawiesii. 
51. C. arbuscula (Dillw.) Lyngb. Hydrophyt., p. 123; Kjellm., 
N. I., p. 224 (178); Phlebothamnion faroense Kiitz., Tab. phycol., 
Vol. 14, tab. 83. 
This is decidedly a littoral species and grows at about half¬ 
tide level. It prefers much exposed coasts, where it occurs grega¬ 
riously more particularly on sharply inclined or vertical faces of 
rocks which are left dry at ebb-tide. I have not come across it 
in rock-pools, which is doubtless to be explained by the fact that 
it cannot thrive unless left dry at intervals. 
Though it is generally met with on open faces of rocks fully 
exposed to the light it may also be found growing rather far into 
caves, but in the latter case it is more poorly developed, the branches 
being more slender and of a paler red, while the branches of those 
growing in broad daylight are of a deep reddish-brown colour. 
Found bearing tetraspores in May, June, July, and November, 
antheridia in June, and cystocarps in June and November. The 
most robust examples occur during the summer months; the au¬ 
tumn and winter specimens which I have had for examination 
