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 Ho s en vinge to this species. These 

 diller Ironi Callith. scopulorum 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. Kjellman (Le.) points out that the Nordland spe- 

 cimens resemble K i'itzing's figure (Tab. Phyc. 11, tab. 97), but not 

 Harveys ligure in Phycol. Brit. pi. 231 ; and this is also the case 

 with the Færoese specimens. 



II is presumably a lilloral species, and it had tetraspores in May. 

 Found only near Tværaa in Trangisvaagfjord Syd. by L. K. Rosen- 

 vinge. 



Callithamnion lanuginosum Lyngh., Hydrophyt., p. 130, 

 which according to Lyngbye has been found: »ad insulas Færoenses 

 in Hutchinsia urceolata aliisque parasitice, raro« seems to be young 

 specimens of Chantransia virgatala. There are, however, only a 

 very few fragmentary pieces of it in Lyngbye' s Herbarium, and 

 on the label Lyngbye 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. L, 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 lefl dry at ebb-tide. I have not come across il 

 in rock-pools, which is doubtless to be explained by the faet 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 



