— 149 — 



m supremo axi primario et in ramulis sessilia aut breve pedicellata, 

 sæpissime in axi primario et in superiore latere ramulorum .secunda, 

 rarius opposita et in ultima cellula terminalia, ovata, obovata aut 

 ellipsoidea, 20— 27 p longa et 14—17 « lata. 

 In stipite Alariæ esculentæ. 



The length of the cells in the primary axis below and above is 2 

 — 3 times and in the middle 5 times larger than their breadth. The 

 upper ends of the cells, especially in the branches, are broader than the 

 lower ends. 



The cells in the creeping, basal filaments are usually as long as they 

 are broad, and often rounded. The colour of this plant I cannot describe, 

 as I have only got it preserved- in alcohol, and on account of its bad 

 condition I am not sure of the shape of the chromatophore, but it seems 

 to be one parietal plate. 



Collected with tetraspores in May. 



S. I c el. Vestmannaeyjar. 



Rhodochorton ininutum Suhr. Descr. in Reinke's Atlas. Fig. Reinke's 

 Atlas T. 40. 



It grows in the litoral region on Gystoclonium purpuras cens. Col- 

 lected with tetraspores in June. 

 S W. I c el. Njarövi'k (C. O.). 



Rhodochorton nenicilliforme (Kjellm.) Rosenv., Les Algues marines 

 du Groenland in Ann. Sc. nat. 7 e Sér. XIX. 



It grows on Sertularia sp. on Fucus in the litoral zone and on La- 

 minaria in the sublitoral region. Collected with tetraspores in March — 

 August. The thickness of the vertical filaments is 11 — 13 ft. 



E. I c el. Berufjöröur, Reyöarfjöröur. 

 N. I c el. Hrisey. 



NW. Icel. lsafjöröur; Dyrafjöröur (CO.). 



SW. Icel. Hvammsfjöröur, Stykkishölmur, Reykjavik. 



Rhodochorton membranaceuin Magnus. Rosenv., Grl. Havalg. p. 794, 

 P. Kuckuck: Beiträge zur Kenntniss der Meeresalgen 1897. 



It grows together with the last species in Sertularia on Fucus in the 

 litoral region and on Laminaria in the sublitoral region. Collected with 

 tetraspores in March— August. The vertical filaments are 7 — 8 fi thick. 

 This species is easily distinguished from the R. penicilliforme. being both 

 considerably narrover and endozoic. 



Probably common round Iceland. 



E. Icel. Berufjöröur, Reyöarfjöröur. 



