377 
Order CERAMIACEAE. 
GRIFFITHSIA G. Agardh. 
48. G. setacea (Ell.) Ag. 
In July 1899 I found in Trangisvaagfjord opposite Tvseraa (Syd.) 
in about 10 fathoms of water a large vigorous, but sterile specimen, 
associated with other Floridese. 
Landt (1. c. p. 233) reports Conferva (Griffithsia) corallina (Lightf.) 
Ag. from the Faeroes, but as this species has not been found since it is 
possible that it was a confusion with the above-mentioned species. 
CALLITHAMNION Lyngb. 
49. C. scopulorum Ag. C. Agardh, Species Algarum, Vol. II, p. 166; 
J. Ag., Spec. Alg., Vol. 2, pars 1, p. 47; Callithamnion roseum § tenue 
Lyngb., Hydrophyt., p. 126, tab. 39. 
In order to ascertain the relationship between this species and 
C. roseum with which I at first thought it to* be most closely allied, 
I compared my material of C. scopulorum — which exactly agrees with 
Lyngbye’s material of what he calls Callithamnion roseum 0 tenue 
— with the specimens labelled C. roseum in the Herbarium of the 
Rotanical Museum in Copenhagen, especially with No. 162 in Le 
Jolis’s Alg. mar. de Cherbourg and No. 703 in Phykotheka univer¬ 
salis, and I came to the conclusion that while my material bore no 
great resemblance to the former it approached closely to the latter. 
In fact these two algae which are here given under one name differ 
so widely from each other, even on a cursory examination that one 
is led to suppose that there must have been a confusion of two 
distinct species; and as our museum with regard to these species is not 
rich in specimens for comparison, and more particularly as it does 
not contain specimens, excepting Le Jolis’s, on the determinations of 
which I could quite rely I wrote to Dr. E. Bor net of Paris for his 
opinion and cannot do better than quote what he very kindly writes 
tome: — »Je n’ai jamais vu d’echantillon authentique de Ceramium 
roseum Roth, Catalecta botanica, II, p. 183, et je ne saurais, d’apres la 
description, reconnaitre l’espece, dont il s’agit. Mais si vous consultez 
l’English Botany, tab. 966 et Dillwyn, p. 17, vous verrez que c’est 
Roth lui-meme qui a nomme les exernplaires recoltes par Sower by 
et qui sont represents dans ces deux ouvrages. Or Dillwyn 
mentionne la particularity suivante: »branclies are repeatedly sub- 
divised, so that as they approach the summits, they have a very 
