367 



When I came across Uiis alga only ;i few specimens of it near 

 Molen where it occurred between tide-marks, il 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. bul I would caU attention to whatFoslie New and critical Nor- 

 wegian Algae, Trondhjem 1894 writes in his report of Lomentaria sedi- 

 folia Turn. Stromf.: I cannol agree with Stromfelt thai L. sedi- 



folia is distinkt from /. clavellosa by characters of the same degree and 

 value as /.. roseer. To my opinion the hitter is a more characterized 

 speeics than the former. Among rather numerous specimens thai I have 

 seen I have not mel with any true transition to L cavellosa, though 

 the species is rather varying. This shows thai Foslie admits of the 

 possibility of the existence of intennediate forms 



The specimens which I found on Heligoland, while visiting the bio- 

 logicai station there, and which grew epiphytically on Laminaria hgper- 

 borea, were quite distinct from /.. cavellosa, which also occurred there; 

 and Dr. Kuckuck told me that he had aever come across intermediate 

 forms. 



PLOCAMIUM (Lamour. Lyngb. 



30. P. coccineum (Huds.) Lyngb., Hydrophyt., j). 39; Kjellm., 



X. I., p. 188 (147). 



Var. typica is the most common; var. uncinala (Harvey, Phyc. 

 Brit., tab. 44, fig. 9) occurred in Trangisvaagfjord. Lyngbye (1. c.) 

 mentions a form fJ subtile, but none of the specimens in his her- 

 barium are marked with this name; it is probably identical with 

 var. uncinala. 



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 

 piaces and is generally epiphytic espeeially 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 piants occurred in April, May, June, October, 

 November and December; cystocarpic in July and August. Kl een 

 found it bearing tetraspores and cystocarps in July and August 

 at Nordland. 



It is an extremely common species of the Færoese coasts, as was 

 mentioned by Lyngbye (1. c. , who savs: — »Habitat elegantissima luec- 

 Alga ad insulas Færoenses copiose. It oecurs in fine, large specimens. 



HALOSACCIOX (Kiitz.) Rupr. 



31. H. ramentaceum (L.) J. Ag. Kjellm., N. I., p. 196 (153). 

 f. robusta Kjellm., 1. c. 



