389 



Thorshavn specimen is a distinct formå decurrens. And further examination 

 likewise proves his Ceramium diaphanum d vireseens (1. c. p. 120) to be 

 small examples of C. rubrum bearing ripe tetraspores. Kither on account 

 of these, or more probably on account of the plant having heen partly 

 dried and killed by a longer intervening period of Iow-water (it having 

 presumably grown between tide-marks) it has a greenish tinge, which 

 induced Lyngbye to name il vireseens. There is. moreover, a small 

 specimen in his herbarium which he himself determined as C. rubrum. 

 Lyngbye's Herbarium contains several typical examples of subforma 

 secundata, among these the original of his figure; one of the examples, 

 which somewhat resembles rny specimens of f. pedicellata, Lyngbye has 

 labelled: - forsan Cer. rnbri var. . 



RHODOCHORTON Någeli. 



61. Rh. membranaceum Magnus. Rosenv., Grønl. Havalg., p. 794; 

 Kuckuck, Beitråge zur Kenntnis der Meersalgen, 2. Uber Rhodo- 

 chorton membranaceum Magnus, eine ehitinbewohnende Alge. 



This species grows in diflerent Brgozoa and Sertularia in the 



tubes of which the endozoic filaments spread themselves. The free 



erect filaments are 6—8 p thick. It has been found in the littoral zone 



as well as in the sublittoral down to depths of above 20 fathoms, 



and occurs both in exposed and sheltered localities. Tetrasporic 



specimens wére found in May, June and November. 



It is doubtless commonly distributed along the coasts of the Fær- 

 oes: — Bor do: Haraldsund (H.J.); Str.: Kalbakfjord (!), Thorshavn (H.J.), 



Gliversnæs (!); Syd.: Trangisvaag (H. J.). 



62. Rh. penicilliforme (Kjellm.) 

 K. Rosenv., Algues mar. du Groenl., 

 p. 66, (Annales d. sci. nat. VI s., t.19); 

 Rhodochorlon mesocarpum (Carm.) 

 Kjellm. var.(?) penicilliforme Kjellm. 

 Rosenv., Grønl. Havalg., p. 792. 



This alga, which is fully de- 

 scribed by Rosen vinge, 1. c, is 

 especially characterized by its 

 elegant basal disc (fig. 60) which 

 has a marginal growth. The erect 

 filaments were about 12 fi. 



It grows on Brgozoa and Ser- 

 tularia, most commonly associated 

 with Hh. membranaceum, and like the latter occurring both in the 

 littoral and in the sublittoral zone, down to a depth of 20 fathoms. 



Fig. GO. Rhodochorton penicilliforme Kjellm. 

 Iiosenv. Portion of basal disc. 350:1. 



