KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 309 
Remark on the determination of this species. 1 hold it to be beyond a doubt that 
the alga which I understand by the above name, is identical with that described and 
figured by the authors quoted under the names of C. gracilis and C. vadorum. Though 
approaching nearly to C. glaucescens, it differs from it by essential characteristics. Its 
relation to the plant commonly called C. gracilis by Scandinavian algologists and dis- 
tributed by me under N:o 119 in Wittr. et Nordst. Alg. exsicc., is a question I can- 
not decide at present. That plant differs much in its habitat from the present species. 
Habitat. On the polar coasts I have always found this alga in hollows filled 
with water on gravelly shores. It is attached at first and it then presents its typical 
aspect. When older, it forms loose intricate masses, exhibiting very little resemblance 
to a typical C. gracilis, as has been correctly pointed out by Fartow |. c. In this 
condition it rather agrees with C. crispata as delineated by Kirzinc, Tab. Phye. 4, pl. 
40, fig. 1 A. Kieren says that he found it attached to other algw in the upper part 
of the sublitoral zone. This appears to be its mode of growth also on the coasts of 
England (Cp. Harv. Phyc. Brit. tab. 18). But on the coasts of lrance and New Eng- 
land its habitat is the same as at Finmarken, and this seems to be the usual case. 
KtrzinG says that it grows »in stagnis marinis et submarinis» (Cp. Spec. Alg. p. 403). 
The present species is gregarious. I have collected specimens with zoospores on the 
coast of Finmarken at the beginning of September. 
Geogr. Distrib. It is known from the Norwegian Polar Sea and Baffin Bay. The 
most northerly point where it is certainly known to grow, is Gjesver about Lat. N. 71°. 
Localities: The Norwegian Polar Sea: Nordlanden rather common; Finmarken, lo- 
eal and not abundant at Gjesver and Talvik. 
Baffin Bay: Greenland according to specimens in the herbarium of the Copenha- 
gen Museum. 
Cladophora Crispata (Rorn) Rapenyu. 
Fl. Eur. Alg. p. 333 et 336. Conferva crispata Rovu. 
With regard to this species found in the White Sea by K. von Barr, the reader 
is referred to Goxpr, Algenfl. Weiss. Meer. p. 85. 
Gen. Rhizoclonium Kirz. 
Phyc. gener. p. 261. 
Rhizoclonium Rigidum Gost. 
Algenfl. Weiss. Meer. p. 85. 
Descr. Rhizoclonium rigidum Gost, |. c. p. S6. 
Exsicc. Conferya fracta f. longissima subsimplex Arerscu. Alg. Scand. exsice, N:o 273. 
Syn. Cladophora fracta Kiren, Nordl. Alg. p. 45. 
Habitat. This species grows in lagoons or depressions in the litoral zone, and is 
at first attached, afterwards floating on the surface as loose masses of indefinite shape. 
It is gregarious. I do not know anything with regard to its propagation. 
