367 
When I came across this alga — only a few specimens of it — near 
Molen where it occurred between tidemarks, it appeared to me to be 
only a form of Lomentaria clavellosa, which also grew there. My ma¬ 
terial is, however, too scanty to allow me to form any definite opinion 
of it, but I would call attention to whatFoslie (New and critical Nor¬ 
wegian Algae, Trondhjem 1894) writes in his report of Lomentaria sedi- 
folia (Turn.) Stromf.: — »I cannot agree with Stromfelt that L. sedi- 
folia is distinct from L. clavellosa by characters of the same degree and 
value as L. rosea. To my opinion the latter is a more characterized 
species than the former. Among rather numerous specimens that I have 
seen I have not met with any true transition to L. cavellosa, though 
the species is rather varying.« This shows that Foslie admits of the 
possibility of the existence of intermediate forms. 
The specimens which I found on Heligoland, while visiting the bio¬ 
logical station there, and which grew epiphytically on Laminaria hyper- 
borea , were quite distinct from L. cavellosa , which also occurred there; 
and Dr. Kuckuck told me that he had never come across intermediate 
forms. 
PLOCAMIUM (Lamour.) Lyngb. 
30. P. coccineum (Huds.) Lyngb., Hydrophyt., p. 39; Kjellm., 
N. I., p. 188 (147). 
Var. typica is the most common; var. uncincila (Harvey, Phyc. 
Brit., tab. 44, fig. 9) occurred in Trangisvaagfjord. Lyngb ye (1. c.) 
mentions a form ft subtile, but none of the specimens in his her¬ 
barium are marked with this name; it is probably identical with 
var. uncinata. 
This species is generally found in the sublittoral zone, but I 
have also come across it in the littoral in caves a little above low- 
water mark. It grows both in the open sea and in more sheltered 
places and is generally epiphytic* especially on the stems of Lami¬ 
naria hyperborea of which it is a characteristic epiphyte; but it is 
also found attached to rocky bottoms especially in caves. 
Tetraspore-bearing plants occurred in April, May, June, October, 
November and December; cystocarpic in July and August. Kleen 
found it bearing tetraspores and cystocarps in July and August 
at Nordland. 
It is an extremely common species of the Fseroese coasts, as was 
mentioned by Lyngbye (1. c.), who says: — »Habitat elegantissima hsec 
Alga ad insulas Fseroenses copiose.« It occurs in fine, large specimens. 
HALOSACCION (Kiitz.) Rupr. 
31. H. ramentaceum (L.) J. Ag. Kjellm., N. I., p. 196 (153). 
f. robusta Kjellm., 1. c. 
