— 136 — 



Actinococciis subcutanea (Lyngb.) K. Rosenv. Grl. Havalg. p. 822. 



In the latest treatise on this Alga 1 ), Da rbi shire mentions it 

 as a distinct species growing parasitically on the antheridia of Phyllo- 

 phora Brodiæi. 



On Phyllophora Brodiæi * interrupta. 



E. I c el. Hüsavi'k, Brimavi'k. 



NW. I cel. Önundarfjöröur (Ldbk.). 



Ceratocolax Hartzii K. Rosenv. Deuxième Mém. p. 34. 



On Phyllophora Brodiæi * interrupta in a depth of 1 4 fathoms. With 

 tetrasporangia in May. 



NW. I c el. Önundarfjöröur (Ldbk.). 



Fam. Rhodophyllidaceæ. 



Cystoclonium purpurascens (Huds.) Kütz., Strömt'. Algveg. p. 30. 



In the lower litoral zone. Collected with tetraspores in NW. Icel. in 

 September. Sometimes it occurs with tendrils. Fronds 10 — 22 cm. high. 



NW. Icel. Hrutafjöröur, Kollafjöröur. Cast ashore at Isafjöröur. 

 (Strömfeit). 



SW. Icel. and S. Icel. common. 



Turnerella Pennyi (Harv.) Schmitz, K. Rosenv. Deuxième Mém. p. 29. 



It grows in the sublitoral region on Lithothamnion in company with 

 Polysiphonia arctica in a depth of 4 — 29 (usually 10) fathoms. I have 

 met with small specimens, 5 mm. high and 3 mm. broad, bearing a close 

 similitude to T. septemtrionalis, attached to Lithothamnion, growing in 

 company with larger specimens, 5 cm. high and 7.5cm. broad, which in 

 everything except that they were attached, resemble the T. Pennyi. I 

 refer without any hesitation all the Icelandic specimens to this species. 

 Regarding the further difference between T. Pennyi and T. septemtrionalis 

 cfr. K. Rosenv. Deuxième Mém. 



E. Icel. rather common. Reyöarfjöröur, Seyöisfjöröur. 

 N. Icel. Eyjafjöröur. 



Euthora eristata (L.) J. Ag., Strömf. Algveg. p. 27. 



It grows in the sublitoral region in a depth of 2 — 20 fathoms on 

 the fibers of Laminariæ , especially L. hyperborea , on shells and various 



J ) Annals of Botany Vol. 13, 1899. 



