349 



This is an extremely common species of the Færoese cnnsts ns w;is 

 inentioned by Lyngbye (1. c), who savs: -- »Habitat ad insulas Færo- 

 enses saxis in summo refluxus liniite ubique et copiosissirae adnascens 



Il was iirst recorded by Landt, 1. c. p. 232. 



Lyngbye (Hydrophyt., p. 10 does not record Ulva purpurea from 

 the Færoes, but bis herbarium contains two specimens which bear this 

 nainc (hev are marked: — Ulva purpurea Lgb. Porphyra purpurea Ag. 

 Færoa), I consider these specimens, which are in faet only small frag- 

 ments, to be identical with P. umbilcalis. 



But Lyngbye Hydrophyt., 1. c-, reports a var. (i elongata of Ulva 

 purpurea as occurring in the Færoes: A'arietas ad saxa maritim;) prope 

 Qualboe, Færoæ, copiose«. None of the specimens in his herbarium are, 

 however, marked with this name, but judging from its habitats, the 

 varietv in question must be identical with the specimens in his herbarium 

 cailed by him *Ulva umbilicalis var. lanceolata* , on the label of which 

 he has further added crispa sinuosa. 8. Juli 1817 ad Qualbo, copiose«. 

 These specimens are like Porphyra umbilicalis f. linearis. 



ERYTHROTRICHIA Aresch. 



0. E. ceramicola (Lyngb.) Aresch. Kjellm., N. I., p. 242 (193); 

 Conferva ceramicola Lyngb., Hydrophyt., p. 144. 



Found along sheltered coast in deep water in about 5 — 8 fathoms, 



epiphytic on Desmarestia aculeata, but Kleen (1. c. 24) mentions 



having found it epiphytic on littoral algæ at Nordland. It had 



spores in June. 



Seems to be rare along the Færoese coasts; I only found it near 

 Ore (Ost.). 



CONCHOCELIS Batters. 



7. C. rosea Batters 1 . Phycological Memoirs edited by Murray, 

 Part I. London 1892. 



The chromatophores are differently described. Batters savs 

 they are star-like, while Schmitz and Hauptfleish (Engler und 

 Prantl, Naturlich. Pflanzenfam. I Teil, 2 Abteil. p. 315) say: »an- 

 scheinend mit wandst åndige m, unregelmåszig scheibenformigem Chro- 

 matophor.« In the material I have had for examination, which 

 was, however, dried, the chromatophores in the large cells appeared 

 to be star-like. 



1 In a paper: Die perforierenden kalkbohrenden Algen und ihre Bedeutung 

 in der Natur (Scripta bøtanica: Fase. 18. p. 35) published by the Hussian investi- 

 gator Nadson he gives it as his opinion, relying on the investigations made at the 

 biologicai station on Heligoland. that C. rosea is identical with Ostreobium Queketti 

 as the latter species is said to be sometimes green and sometimes red. It must 

 be owned. that these two species resemble each other very closely, so that his ob- 

 servations mav very possibly prove to be true. Here I have. however, preferred to 

 retain Conchocelis rosen. 



