Farn. Squamarïaœœ. 



Peyssonellia Dcsne. 



9. P. Rosenvingii Schmitz, K. Rosenv. Deux. Mém. p. 14. 



Criioria Fries. 



10. (.'. arctica Schmitz, K. Kosenv. Deux. Mém. p. 1.5. 



Petrocelis J. Ag. 



11. P. polygyna (Kjellm.) Schmitz, Kosenv. Deux. Mém. p. 16. 

 The species was found on stones, together with Lithoderma 



fatiscens and Lithoth amnion. The greater part of the stones 

 were fastened to the haptera of species of Laminaria. Petro- 

 celis polygijna was abundant on the stones, and often the 

 Lithoderma crust was overgrown by it. The main part of the 

 material from Kap Borlase Warren and Sabine Ö was sterile, 

 and only in a few cases I have met with carpogonia. 



Specimens gathered in July at Stenö were rich in starch, 

 the uppermost cells excepted, as mentioned by Rosen vinge 

 (I. c.) and were supplied with gonimoblasts. 



Gr. or.: Stenö, Kap Borlase Warren on exposed shore, in a 

 depth of 5 fathoms, Sabine Ö in a depth of 5 — 10 fathoms. 



Rhododermis Crouan. 



12. Rh. elegans Crouan, K. Rosenv. Deux. Mém. p. 18. 



Tarn. Dumontiaceœ. 



Dilsea Stackh. 



13. D. iotegra (Kjellm.) K. Rosenv. Deux. Mém. p. 19. 



The specimens I have had for examination are up to 15 cm. 

 long and 4 cm. broad. Most of the specimens have almost 

 perfectly even margins. The species was collected in July, in 

 an exposed place, in a depth of 3—8 fathoms. 



Gr. or.: Sabine Ö. 



