389 
Thorshavn specimen is a distinct forma decurrens. And further examination 
likewise proves his Ceramium diaplianum d virescens (1. c. p. 120) to be 
small examples of C. rubrum bearing ripe tetraspores. Either on account 
of these, or more probably on account of the plant having been partly 
dried and killed by a longer intervening period of low-water (it having 
presumably grown between tide-marks) it has a greenish tinge, which 
induced Lyngbye to name it virescens. 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 my specimens of f . pedicellata, Lyngbye has 
labelled: — »forsan Cer. rubri var.«. 
RHODOCHORTON Nageli. 
61. Rh. membranaceum Magnus. Rosenv., Gronl. Havalg., p. 794; 
Kuckuck, Beitrage zur Kenntnis der Meersalgen, 2. Uber Rhodo- 
chorton membranaceum Magnus, eine chitinbewohnende Alge. 
This species grows in different Bnjozoa and Sertularia in the 
tubes of which the endozoic filaments spread themselves. The free 
erect filaments are 6—8 y 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 were found in May, June and November. 
It is doubtless commonly distributed along the coasts of the Faer¬ 
oes: — Bor do: Haraldsund (H.J.); Str.: Kalbakfjord (!), Thorshavn (H.J.), 
Gliversnaes (!); Syd.: Trangisvaag (H. J.). 
62. Rh. penicilliforme (Kjellm.) 
K. Rosenv., Algues mar. du Groenl., 
p. 66, (Annales d. sci. nat. VI s., 1.19); 
Rhodochorton mesocarpum (Carm.) 
Kjellm. var.(?) penicilliforme Kjellm. 
Rosenv., Gronl. Havalg., p. 792. 
This alga, which is fully de¬ 
scribed by Rosenvinge, 1. c., is 
especially characterized by its 
elegant basal disc (fig. 60) which 
has a marginal growth. The erect 
filaments were about 12 p. 
It grows on Bryozoa and Ser¬ 
tularia, most commonly associated 
with Rh. membranaceum, and like the latter occurring both in the 
littoral and in the sublittoral zone, down to a depth of 20 fathoms. 
25 * 
Fig. 60. Rhodochorton penicilliforme (Kjellm.) 
Rosenv. Portion of basal disc. 350 : 1. 
