388 
rare in sheltered. Lyngbye refers this species to C. ciliatum, and in 
his herbarium there are specimens of it from Thorshavn and Andefjord. 
Though he did not gather true C. ciliatum in the Faeroes, yet his figure 
(tab. 10) is undoubtedly this species, so it must have been drawn from 
the specimens of C. ciliatum from the Mediterranean which are also to 
be found in his herbarium. 
This species, which was first reported from the Faeroes by Lyng¬ 
bye, is very common there. 
60. C. rubrum (Huds.) Ag. J. Ag., Spec. alg. II, p. 127 and III, 
p. 100; Kj ell in., N. I., p. 214 (170); Foslie, The Norwegian forms of 
Geramium, p. 14. 
f. genuina Kjellm. 
f. decurrens J. Ag. 
f. prolifer a J. Ag. 
subf. secnndata (Lyngb.). Ceramium secundatum Lyngb., 
Hydrophyt., p. 119. 
subf. prolifera (Lyngb.). 
f. corymbifera (Bonnem.) J. Ag. Foslie, 1. c. p. 15, tab. 3, fig. 6. 
f. fasciculata (Bonnem.) J-Ag. Foslie, 1. c. p. 15, tab. 3, figs. 2—3. 
Besides these, there were a few specimens which may possibly 
be referred to f. tenuis (Ag.) and f. pedicellata Duby. 
Ceramium rubrum is an extremely variable species, and of its 
numerous forms I think I have been able to distinguish the above- 
mentioned. Of these, forma decurrens seems to be the most common; 
forma genuina is more rare. The characteristic subforma secundata 
(Lyngb.), of which there is an excellent drawing in Lyngbye’s 
Hydrophyt., tab. 37, A, is fairly common in the Corallina- belt. 
Along the coasts of the Faeroes this species grows both in 
the littoral zone near low-water mark and in rock-pools, and in 
the sublittoral, and it occurs on fairly exposed coasts as well as 
sheltered, perhaps more commonly on the latter. Usually it grows 
on rocky and stony bottoms, but it is also frequently found epiphytic 
on Fucus, Ascophyllum, Himanthalia, Laminaria and other algae. 
Tetraspore-bearing plants were found from April to November 
and cystocarpic from May to July, which agrees very well with 
what Kleen (1. c. p. 20) says is the case in Nordland. 
This is an extremely common species of the Faeroese coasts. Strangely 
enough, as pointed out by Rostrup, p. 84, Lyngbye does not record 
the main species from the Faeroes; but there are several specimens of it 
in his herbarium. Thus, Lyngbye’s specimens of Ceramium diaphanum 
(Hydrophyt. p. 119), of which there are two in his herbarium, one from 
Thorshavn and one from Eide, are forms of the main species; the 
