— 130 — 



Rhodophyceæ. 



Bangioideæ. 

 Farn. Bangiaceæ. 



Bangia fnscopurpurea (Dillw.) Lyngb., Rosenv. Grl. Havalg. p. 831. 



On rocks at high -water-mark. Collected with tetraspores in June- 

 September, with cystocarps and antheridia in May-July and September. 

 3 — 10 cm. high. Probably common. 



E. I cel. common and abundant. 



N. I c el. Grimsey (O. D.) ; Eyjafjöröur. 

 NW. I c el. Kolbeinsâ, Skâlholtsvfk. 

 SW. Icel. Flatey, Stykkishölmur, Barkanautur. 

 S. Icel. Vestmannaeyjar. 



Porphyra umbilicalis (L.) J. Ag., Rosenv. Grl. Havalg. p. 830, P. 

 laciniata Ström f. Algveg. p. 34. 



On rocks at high -water -mark. Gommon and abundant round the 

 Icelandic coasts. Collected with tetraspores in March-October, with cysto- 

 carps in June-August, and with antherida in June. 16—26 cm. high and 

 4—37 cm. broad. 



f. typica is the most common and 



f. laciniata rather common. 



f. linearis. In the lower litoral zone in Vestmannaeyjar I met with 

 specimens (71 cm. long and 6 cm. broad) which were thicker, narrower 

 and longer than usually. Probably the same form as mentioned by 

 Strömfeit (1. c. p. 34) from E. Icel. and by him named f. linearis. 



Porphyra miniata (Ag.) Ag., Rosenv. Grl. Havalg. p. 826. Diploderma 

 m., D. tenuissimum, D. amplissimum Strömf. Algveg. p. 33. 



In rock-pools in the lower litoral zone and in the upper sublitoral 

 region to a depth af c. 10 fathoms. 



F. typica is the most common and grows abundantly round the 

 coasts of Iceland. Diploderma tenuissimum Strömf. I refer to the f. 

 typica. I have examined one of Strömfelts original specimens, it was 



