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E. Icel. Fossârvi'k; Hölmanes (Slrömfelt). 



N. Icel. Eyjafjöröur (in many places); Skagafjöröur (Strömfeit). 

 NW. Icel. Prestsbakki, Kolbeinså; Isafjöröur (Strömfeit); Dyrafjöröur 

 (G. 0.). 



SW. Icel. Melar; Reykjavik (CO.). 



Fam. Punctariaceæ. 



Oinphalophyllum ulraceuin K. Rosenv. Gr], Havalg. p. 872. fig. 19. 



The Icelandic specimens attain a size of about 10 cm. in diameter 

 and agree precisely with Rosenvinge's description and figures (1. c.) of the 

 Greenlandic plants. It is hitherto only known from one place in E. Ice- 

 land, where it occurred abundantly down to a depth of 10 — 20 fathoms 

 in company with Polysiphonia arctica. Gathered with unilocular sporangia 

 in July. 



E. Icel. Vattarnes. 



Punctaria plantaginea (Roth) Grev., Rosenv. Grl. Havalg. p. 871, Deux. 

 Mém. p. 71; Strömf. Algveg. p. 50. 



This species has only been found in few places, and belongs to the 

 lower litoral region, where it occurs in rock-pools. It has been collected 

 with unilocular sporangia in May and September. The Icelandic specimens 

 are up to 20 cm. long and 1— 2 cm. broad. 



In transverse section of the frond the Icelandic specimens usually 

 consist of 4 cellrows, two in the middle and one row of cortical cells 

 on each side. The cortical cells are usually smaller than the cells in 

 the middle; they are nearly isodiametric, or sometimes considerably smaller 

 in the direction parallel with the surface of the plant. The cells in the 

 middle are about isodiametric, or sometimes considerably larger in the 

 direction parallel with the surface. An old specimen, nearly totally over- 

 grown with epi- and endophytes, had in the middle more than two rows 

 of cells, and the cells were somewhat irregularly formed, sometimes 

 round (in transverse section). 



The base of the hairs of this species is enclosed in a sheath of the 

 same appearance as in Punctaria latifolia (Thuret & Bornet: Etudes phy- 

 cologiques pl. V). 



The Icelandic specimens seem to agree very well with the Greenlandic 

 plants described by Rosenvinge (Deux. Mém. 1. c). Both the Icelandic and 

 the Greenlandic specimens agree in some respects with the genus Punctaria 

 J. Ag. *) and in other respects with Homoeostroma J. Ag., and have thus 



J ) J. G. Agardh: Analecta algologica. Observationes de speciebus algarum 

 minus cognitis earumqve dispositione. Continuatio III. Lundæ 1896. 



