387 
branches there often occurred two smaller at the same height, but 
they were always much smaller than these, and also than the one 
in Kj ell man’s fig. 4. The specimens bear quantities of glands 
(see fig. 59). 
In the Faeroes the species occurs in the sublittoral zone down to 
a depth of about 25 fathoms. It is met with along exposed coasts 
(especially the main form) as well as sheltered (especially var. boreale). 
Grows sometimes on stones and shells and sometimes epiphytic on 
different algae. Tetraspores were found in May, June, July and 
November; antheridia in May and July. 
The main form occurred in the following localities: — Bor do: 
Haraldsund (!); Ost.: Ore (!); Str.: Gliversnses (!). — Var .boreale: — Ost.: 
Fuglefjord (!), Ore (!). — F. corallina : — Str.: Thorshavn (!); Vid.: on the 
haptera of Laminaria hyperborea in 3—4 fathoms of water (H. J.). 
CERAMIUM (Roth) Lyngb. 
59. C. acanthonotum Carm. Kjellm., N. I., p. 216 (171); Kleen, 
Nordl. Alg., p. 19; C. ciliatum Lyngb., Hydrophyt., p. 121 ex parte. 
Specimens bearing several spines on each articulation were 
frequently met with, which might consequently be referred to 
f. coronata (Kleen, 1. c. p. 19), but they merged by such easy transi¬ 
tional stages into the main form — both forms in fact occurring 
in the same tuft — that there is no reason to separate them as a 
distinct variety, as also pointed out by Kjellman, 1. c. 
It is a littoral species and grows at half-tide level, producing 
there a characteristic formation together with Callithamnion arbuscula. 
It prefers open shores and occurs in the most exposed localities, 
where it is left quite dry at ebb-tide, without, however, getting 
dried up, which would prove fatal to it on account of its somewhat 
delicate structure. It grows in small, irregularly-shaped clumps, 
rendered almost spongy in character by its numerous ramifications 
as well as by its spines, rhizoids and many epiphytes, especially 
Chantransia secundata, Isthmoplea and Diatoms, and this enables it 
to absorb a quantity of water which it retains during ebb-tide, and 
which can be squeezed out of it as out of an ordinary sponge. It 
seldom occurs in rock-pools. 
Tetraspore-bearing plants were found in May, June, November, 
and December. 
Lyng'bye, 1. c., writes with reference to its habitat: »Habitat ad 
insulas Fseroenses in summo refluxus limite rupibus hie illic dense et 
copiose adnascens«. It is very common in exposed localities and rather 
Botany of the Faroes. 
25 
