387 



branches there olien occurred two smaller at the same height, but 

 Ihev were always mueh smaller tban these, and also than the one 

 in Kjt'llman's Hg. 4. The specimens bear quantities of glands 

 (see fig. 59). 



In the Færoes the species occurs in the suhlittoral zone down to 

 a deptb of aboul 2."> 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 

 differenl algæ. Tetraspores were found in May, June, July and 

 November; antheridia in May and July. 



The main form occurred in the following localities: - Bordo: 

 Haraldsund (! ; Ost.: Ore(!j; Str.: Gliversnæs !). — 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. 21(> (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 nierged by such easy transi- 

 lional stages into the main form - - both forms in faet occurring 

 in the same tuft — that there is no reason to separate them as a 

 distinet 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, hthmoplea 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 piants were found in May, June, November, 

 and December. 



Lyngb ve, 1. e., writes with reference to its habitat: »Habitat ad 

 insnlas Færoenses in summo refluxus limite rupibus hic illic dense et 

 copiose adnascens . It is very conimon in exposed localities and rather 



Botany of the Færoes. 25 



