KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 121 
Forma Kiitzingii appears to have grown in narrow, densely overgrown rock-pools within 
the litoral zone, rich in Mytilus edulis and shells. Whether AGarnu by his Mutchinsia 
Brodiai typica has really meant the beautiful alga distributed by Arescnoua in Ale. 
Scand. exsicc. N:o 64 under the name of Polysiphonia penicillata, is a question | must 
leave undecided at present. However, his diagnosis accords well with this forin. Se- 
veral specimens from the Polar Sea belong evidently to P. penicillata Arescn. That 
this cannot well be regarded as one of the other forms in a young condition, appears 
to be proved by its being profusely fructiferous. 
The form named by me f. Lyngbyei @ lava, which is most probably to be con- 
sidered as the typical P. Brodiaz, is well represented by the quoted figure in LynGpyr. 
Near it stands a more robust form with dense clusters of branches that are confluent 
upwards. I have found this form on the west coast of Sweden in open places exposed 
to a heavy surge. 
Habitat. According to Kieen, this alga occurs in the southern part of the Nor- 
wegian Polar Sea on exposed coasts in rock-pools within the litoral zone, but it was 
not to be found in the interior of the large bay, Saltenfjord, investigated by him. It 
seems thus to be a pelagic form. It possibly grows here, as farther to the south, 
pretty gregarious in large masses. KLEEN says nothing on this point. On the coast of 
Nordlanden it bears sporangia in July and August. 
Geogr. Distrib. It is known only from the Atlantic region of the Polar Sea, and 
exclusively from its southern part. 
Locality: The Norwegian Polar Sea: at Nordlanden pretty common. 
Polysiphonia fibrillosa (Dittw.) Grev. 
in Hook. Brit. Fl. 2, p. 334; Conferva fibrillosa Drttw. Brit. Conf. p. 86. 
Descr. Polysiphonia fibrillosa J. G. Ac. Spee. Alg. 2, p. 991. 
Fig. » lasiotricha Kiitz. Phye. gener. t. 49. 
Syn. Polysiphonia violacea Kuren, Nordl. Alg. p. 13. 
Remark on the determination of the species. The plant recorded by Ktiren in his 
work on the alge of Nordlanden under the name of P. violacea, judging by the spe- 
cimens in his herbarium, is not that species, but P. jibrillosa. It differs certainly by 
the richer branching, less strongly developed cortical layer, and greater flaccidity, from 
English specimens of this plant, but still it agrees with these in the main. It comes 
nearest to the P. laciotricha figured by Kotrzina |. ¢., which according to J. G. AGARDH 
ought to be identified with P. fibri/losa. The difference exhibited by the specimens 
from Nordlanden as compared with the English, depends probably on the former having 
grown in deep water, while on the coasts of England the plant is litoral. 
Habitat. It has been found in the Polar Sea in several fathoms water, attached 
to shells, or dead parts of Fucus, or to Desmarestia aculeata, and bearing tetraspores in 
the month of August. 
Geogr. Distrib. It is known only from the southern part of the Atlantic region 
of the Polar Sea. 
K. Vet. Akad. Handl. Bd 20. Nio 5. 16 
