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Genera incertæ sedis. 
Conchocelis Batters 1892. 
1. Conchocelis rosea Batters. 
E. A. Batters, On Conchocelis, a new genus of perforating Algæ, in G. Murray, Phycological Memoirs, 
Part I, London 1892, pp. 25—28, Pl. VIII. G. Nadson, Die perforierenden (kalkborenden) Algen. 
(Russian with abstract in German), Scripta Botanica Horti Univ. Petropolit. fasc. 18, 1900, pp. 
14—19, 36—37. L. Kolderup Rosenvinge, On the Marine Algæ from N. E. Greenland. Meddelelser 
om Grønland, 43, 1910, p. 111. H. Printz, Algenveg. d. Trondhjemsfjordes. Skrifter utg. af D. Norske 
Vid.-Akad. Oslo. 1926, pp. 54, 257. 
Batters described in 1892 a perforating red Alga living in the calcareous shells 
of Molluses gathered near the coast of Scotland. The frond consists of a horizontal 
layer of thin, branched interlaced filaments giving off irregular inflations, which are 
simple or branched, and consist of from two to ten cells, each containing a star- 
shaped chromatophore. According to BATTERS the plant appears to be reproduced 
by means of spores formed in the cells of the inflations, one spore in each cell. 
He had “seen globular bodies which appear to be spores escape from the cells”. 
In accordance with Bornet he referred the plant to the Porphyraceæ (Bangiacee). 
The plant seems to be widespread for it has been met with repeatedly at the 
shores of northern Europe and in the Arctic Sea, but it is as yet imperfectly known. 
Napson advanced (1900) the opinion that it was not a Rhodohycea but only a red 
variety of the green Alga Osireobium Quekeiti Born. et Flah.: this opinion, however, 
has not been accepted by later authors (KoLDERUP ROSENVINGE 1910, Printz (1926), 
and it can be taken for granted that Conchocelis rosea has been confounded by 
Napson with a red variety of Ostreobium Queketti. Printz found such a red form 
of the last named Alga in the neighbourhood of Trondhjem, and I found a similar 
form in the Northern Kattegat, but they were both quite distinct from Conchocelis 
rosea. After having examined specimens of the latter gathered in East Greenland I 
maintained, though with doubt, that it could be referred to the Bangiacew, which 
classification was principally founded on the lack of pits in the transverse walls 
and the supposed presence of spores comparable to the monospores of the Bangiacee. 
On examining the Danish specimens of the species, I have, in order to gain a 
better determination of its systematic position, directed my attention in particular 
to the structure of the chromatophores, the presence or want of a pit in the 
transverse walls, and the reproduction. 
The species is fairly widespread in the Danish waters where it grows in the 
shells of various molluscs; but it is most easily accessible when it occurs in the 
calcareous tubes of Spirorbis and Pomatocerus triquetrus, two Serpulids often attached 
to Furcellaria a. o. Algæ, and the shells of which are frequently pink owing to the 
abundant occurrence of Conchocelis rosea. For a study of the finer structure of this 
plant the shells of these Serpulids were treated with acetic acid, Carnoy’s fluid, 
